JP2010156123A - Telescopic truck frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a telescopic truck frame which has a constitution enabling a center frame and a side frame to be separated and assembled in a short period of time by facilitating the separation and assembly of the center frame and the side frame. <P>SOLUTION: Guide frames 17 formed in a prismatic shape are provided rightward and leftward in the front and rear of the center frame 16 for installing upper machinery, respectively. Prismatic telescopic frames 18 are internally fitted in such a manner as to be expandable and contractible rightward and leftward from the front and rear guide frames 17, respectively. A telescopic cylinder 21 for expanding and contracting the telescopic frames 18 with respect to the guide frame 17 is provided in the state of being housed in the telescopic frame 18 and the guide frame 17. The telescopic frame 18 is detachably attached to the side frame 19 with a travel driving means by a bolt 30. A portion as high as/higher than the center frame 16 is presupported by a jack; and the telescopic frame 18 is detached from the side frame 19, and separated from the side frame 19 by contracting the telescopic cylinder 21. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a telescopic track frame constituting a lower traveling body of a construction machine such as a hydraulic excavator, a crane, or an application machine thereof.

  In a construction machine such as a hydraulic excavator, when transporting using a trailer, the width of the lower traveling body is made narrower (reduced) so that it can be easily transported. There is one that increases (widens) the width to improve the stability of the machine, that is, one that has an extendable track frame. As shown in the plan view of FIG. 10, the conventional telescopic track frame generally has left and right side frames that are provided with a rectangular tube-shaped guide frame 51 that projects left and right on the front and rear of the center frame 50, and the crawler belt 52 is wound around. 53 is provided with a rectangular tube-shaped fitting portion 54 for fitting the guide frame 51 in a slidable manner. An extension cylinder (not shown) for expanding and contracting the left and right side frames 53 with a width indicated by L1 is attached between the center frame 50 and the side frames 53 (see Patent Document 1). Are locked by a lock pin (not shown) in the widened state and the reduced width state.

Further, as another conventional telescopic track frame, as shown in the plan view of FIG. 11, a protruding frame 56 is welded to the side frame 53 so as to protrude inward, and the protruding frame 56 is connected to the front and rear of the track frame 50. Some of them are slidably fitted to a rectangular tube-shaped guide frame 57 provided in the above.
JP 2006-291893 A

  In general, when a construction machine becomes larger, it becomes impossible to transport the entire construction machine with a trailer only by the above-described expansion and contraction of the truck frame. In this case, it is necessary to separate and transport the left and right side frames together with the crawler track etc. from the center frame on which the upper revolving unit is installed, and to transport by trailer and assemble on site. In the construction machine having the conventional telescopic track frame shown in FIG. 10, when the side frame 53 is separated from the center frame 50, the center frame 50 is placed on the jack 60 as shown in FIG. The center frame 50 is slightly lifted together with the side frame 53, and in this state, a wire rope 61 suspended from the crane is hung on the side frame 53 and lifted to connect the guide frame 51 and the side frame 53 (not shown). And the side frame 53 is moved horizontally along the guide frame 51 as indicated by the arrow 62 while being separated by the crane operation (see FIG. 13).

  On the contrary, when assembling, the center frame 50 is slightly lifted by the jack 60, the wire rope 61 suspended from the crane is hung on the side frame 53, and the square frame of the side frame 53 is operated by crane operation. The fitting portion 54 is fitted to the guide frame 51, the side frame 53 is horizontally moved in the direction opposite to the arrow 62 along the guide frame 51, and the side frame 53 is connected to the guide frame 51 with a pin and assembled.

  Thus, in the large construction machine having the telescopic track frame shown in FIGS. 10 and 13, when separating the side frame 53, the fitting portion 54 of the side frame 53 is removed from the guide frame 51, It is necessary to pull out to a position where the frame 53 and the crawler belt 52 do not interfere with the guide frame 51 and separate them. Therefore, a large space is required for separation, and when the side frame 53 is separated by a crane as shown in FIG. 13, the moving distance L2 in the suspended state of the side frame 53 is large, and separation is not easy. There is a problem.

  In addition, if there is a large gap between the inner surface of the fitting portion 54 of the side frame 53 and the outer surface of the guide frame 50, rattling occurs in the fitted state of both, so the gap between the two is designed as small as possible. For this reason, when separating, the side frame 53 cannot be pulled out unless the side frame 53 is moved horizontally while paying close attention so that the side frame 53 is always perpendicular to the guide frame 51. Actually, the operation is not easy, and the separation work takes a long time.

  Similarly, when assembling, a large space is required for assembling, the moving distance in the suspended state of the side frame is large, and both the fitting portion 54 of the side frame 53 and the guide frame 51 are in the fitted state. Since the gap is designed to be narrow, it is not easy to fit the fitting portion 54 to the guide frame 51, and the direction of the side frame 53 is always perpendicular to the guide frame 51. It is necessary to move horizontally and combine them, and assembly takes a long time.

  On the other hand, also in the case of the telescopic track frame shown in FIG. 11, when separating and assembling for transportation, a large space is required for separation and assembly as in the case of the telescopic track frame of FIGS. In addition, there is a difficulty in work in which the side frame 53 must be moved horizontally at a right angle to the guide frame 57 at all times.

  Further, in the telescopic track frame shown in FIG. 11, when the side frame 53 is lifted together with the crawler belt 52 by a crane, the protruding frame 56 provided so as to protrude from the inner surface together with the side frame 53 is also lifted. The entire center of gravity of the assembly including the side frame 53 to be lifted, the crawler belt 52, the protruding frame 56, and the like is deviated to the protruding frame 56 side. For this reason, the frictional resistance between the projecting frame 56 and the guide frame 57 at the time of separation increases, and separation becomes more difficult than in the case of the conventional configuration of FIGS. Further, when assembling, since it is tilted so that the protruding frame 56 side is lowered in a state where it is lifted by a crane, it is difficult to insert the protruding frame 56 into the guide frame 57, and the assembly becomes more difficult. There is.

  In view of the above problems, an object of the present invention is to provide an extendable track frame having a configuration in which the center frame and the side frame can be easily separated and assembled, and can be separated and assembled in a short time.

The telescopic track frame according to claim 1 is a telescopic track constituting the lower traveling body of a construction machine comprising a lower traveling body, an upper revolving body on the lower traveling body, and a work attachment attached to the upper revolving body. In the frame,
A center frame on which the upper swing body is installed;
A guide frame having a rectangular tube shape provided in the left-right direction on each of the front and rear sides of the center frame;
A telescopic frame having a rectangular tube shape that fits in the left and right directions from the front and rear guide frames.
A telescopic cylinder, housed in the telescopic frame and the guide frame, for extending and contracting the telescopic frame with respect to the guide frame;
And a side frame which is disposed on the left and right of the center frame and to which the telescopic frame is detachably attached by bolts.

The telescopic track frame according to claim 2 is the telescopic track frame according to claim 1,
The center frame is supported in a state where the side frame is in the maximum widened state by a support means while being separated from the ground, the bolt connection between the telescopic frame and the side frame is released, and then the telescopic frame is contracted, The expansion / contraction stroke of the expansion / contraction frame is set so that the frame does not interfere with the side frame.

The telescopic track frame according to claim 3 is the telescopic track frame according to claim 1 or 2,
The telescopic cylinder has a bottom side end connected to the guide frame side, a piston rod connected to the telescopic frame side,
Provided in the vicinity of the piston rod connecting portion of the telescopic cylinder on the lower plate portion of the telescopic frame is a guide member having a tapered guide groove in which the telescopic cylinder side is enlarged,
Pin holes are provided at locations corresponding to the outermost boss receiving portions in the guide grooves in the upper and lower plate portions of the telescopic frame,
When the telescopic frame is inserted into the guide frame and the boss receiving portion comes into contact with the boss at the tip of the piston rod of the telescopic cylinder, the position of the pin hole of the boss at the tip of the piston rod is above the telescopic frame. It has the structure which corresponds to the position of the pin hole of a board part and a lower board part, It is characterized by the above-mentioned.

  According to the first aspect of the present invention, when the side frame is separated from the center frame, the center frame is supported on the ground by a support means such as a jack in a widened state, and the bolts that attach the extendable frame to the side frame are removed. By retracting the telescopic cylinder, the side frame can be separated from the telescopic frame. For this reason, when separating the side frame together with the crawler belt, etc., the space on the construction machine side for separation may be a space installed in the widened state of the construction machine or a space slightly larger than that space. Space is small. Further, when separating, it is not necessary to horizontally move the side frame while accurately controlling the posture of the side frame with respect to the guide frame of the center frame, and separation becomes easy.

  When assembling, the assembly can be performed in the reverse order of the separation, and it is sufficient if there is a widened construction machine space or a space slightly larger than the space as in the case of separation. In addition, it is not necessary to horizontally move the side frame while accurately controlling the posture with a crane as in the prior art, and the telescopic frame is extended by the telescopic cylinder so that the connecting portion at the tip of the telescopic frame is aligned with the connecting portion of the side frame. It is sufficient to attach them, and the assembly becomes easy. For this reason, the time required for the separation and assembly of the side frame and the center frame can be greatly shortened.

  According to the invention of claim 2, when separating the side frames, if the center frame is supported on the ground by a support means such as a jack from the maximum widened state, and the telescopic frame is contracted to the maximum contracted state, Since the telescopic frame retracts to a position where it does not interfere with the crawler belt or side frame, the side frame can be pulled up directly by the crane, eliminating the need for horizontal movement of the side frame by the crane. In addition, since the horizontal movement operation by the crane can be made unnecessary, the separation and assembling work becomes easier.

  According to the invention of claim 3, when the telescopic frame is inserted into the guide frame and the outermost boss receiving part in the guide groove abuts on the boss at the tip of the piston rod of the telescopic cylinder, Since the position of the boss at the tip of the piston rod coincides with the positions of the pin holes of the upper and lower plate portions of the extendable frame, it is easy to connect the extendable frame to the extendable cylinder with pins.

  In other words, when the telescopic frame is pushed into the guide frame with the piston rod of the telescopic cylinder being inserted into the telescopic frame, the boss position of the piston rod is moved by the guide action of the guide rod against the piston rod boss by the guide groove of the guide member. It automatically matches the pin hole positions of the upper and lower plate portions, eliminating the need for boss alignment. For this reason, the pin insertion work of the piston rod to the telescopic frame can be performed quickly and easily. The ease of this pin insertion work is effective when the telescopic frame is assembled to the guide frame in the manufacturing process. Further, if the telescopic frame is separated and transported, the assembly work of the truck frame becomes easy.

  FIG. 1 is a side view showing an example of a construction machine showing an embodiment of the telescopic track frame of the present invention. In this example, the construction machine is a hydraulic excavator. Reference numeral 1 denotes a lower traveling body, and 2 an upper revolving body installed on the lower traveling body 1 via a revolving device 3. A hydraulic power unit 4 and an operator cab 5 are mounted on the upper swing body 2. A work attachment 6 is attached to the upper swing body 2.

  The working attachment 6 includes a boom 7 that can be raised and lowered on the upper swing body 2, a boom cylinder 8 for raising and lowering the boom that is mounted between the boom 7 and the upper swing body 2, and a pivot at the tip of the boom 7. An arm 9 that can be attached, an arm cylinder 10 for turning an arm that is attached between the boom 7 and the arm 9, a bucket 12 that is attached to the tip of the arm 9 so as to be rotatable, and a bucket 12 that rotates. Are provided with a bucket cylinder 13 and a link mechanism 14 attached between the arm 9 and the bucket 12.

  2 is a plan view showing the combined structure of the center frame and the side frame of the lower traveling body 1, FIG. 3 is a side view of the lower traveling body 1, and FIG. 4 is a front view showing the combined structure of the center frame and the side frame. FIG. 5 and FIG. 5 are vertical sectional views of the same. As shown in FIG. 2, the track frame 15 constituting the framework of the lower traveling body 1 includes a center frame 16 having a mounting portion 16 a on which the turning device 3 shown in FIG. Two rectangular guide frames 17 provided to the front and the front and rear guide frames 17 are fitted into the left and right sides of the guide frame 17 so as to protrude and retract from the both ends of the guide frame 17, respectively. A cylindrical telescopic frame 18 and side frames 19 that are respectively arranged on the left and right sides of the center frame 16 and to which the telescopic frame 18 is attached by a mechanism that will be described later.

  A drive sprocket 25 is attached to the rear portion 19a of the side frame 19 as shown in FIGS. The drive sprocket 25 is driven by a travel motor (not shown) made of a hydraulic motor. A driven wheel 26 is attached to the front portion 19 b of the side frame 19, and a crawler belt 27 is hung around the drive sprocket 25 and the driven wheel 26. Rollers 29 for supporting the crawler belt 27 are attached to the upper and lower surfaces of the side frame 19. Traveling drive means attached to the side frame 19 is constituted by the devices indicated by reference numerals 25 to 29 and the travel motor.

  6 and 7 are partially enlarged views of FIGS. 2 and 5, respectively. 2 and 5 to 7, reference numeral 21 denotes an expansion / contraction cylinder composed of a hydraulic cylinder that expands / contracts each expansion / contraction frame 18. Each telescopic cylinder 21 is accommodated in the telescopic frame 18 and the guide frame 17. The telescopic cylinder 21 is attached by connecting the boss 21 a at the bottom end to the guide frame 17 by a pin 22 and connecting the boss 21 b at the tip of the piston rod to the telescopic frame 18 by a pin 23.

  As shown in FIG. 3, mounting seats 31 are attached to the side frame 19 so as to be detachably attached to the side frame 19 before and after the upper surface of the side frame 19. As shown in FIGS. 4 and 5, the mounting seat 31 has a screw hole 31 a for mounting the bolt 30. A flange 32 for welding to the mounting seat 31 with a bolt is welded to the tip of the telescopic frame 18. The flange 32 has a bolt insertion hole 32 a for being attached to the mounting seat 31 with a bolt 30.

  Reference numeral 33 denotes a lock pin for locking the telescopic frame 18 with respect to the guide frame 17. As shown in FIG. 6, a pin hole 36 into which the lock pin 33 is inserted is provided in the side plate portion 17 a of the guide frame 17. The side plate portion 18a of the telescopic frame 18 on the side plate portion 17a side is provided with two pin holes into which the lock pin 33 is inserted when the telescopic frame 18 is extended and contracted with a gap in the longitudinal direction of the telescopic frame 18. 34 and 35 are provided.

  As shown in FIGS. 6 and 7, a guide member 40 is provided on the lower plate portion 18 b of the telescopic frame 18. The mounting position of the guide member 40 is in the vicinity of the piston rod connecting portion of the telescopic cylinder 21. The guide member 40 has a tapered guide groove 40a in which the telescopic cylinder 21 side is enlarged. Further, pin holes 41 and 42 are provided so as to be concentric with the upper plate portion 18c and the lower plate portion 18b of the telescopic frame 18. These pin holes 41 and 42 correspond to the outermost arc-shaped boss receiving portion 40b in the guide groove 40a, and are concentric with the inscribed circle of the boss receiving portion 40b. This inscribed circle has the same diameter as the boss 21 b at the tip of the piston rod of the hydraulic cylinder 21. Reference numerals 43 and 44 denote bosses welded to the lower surface of the upper plate portion 18c and the upper surface of the lower plate portion 18b, respectively. The pin holes of these bosses 43 and 44 are concentric with the pin holes 41 and 42, respectively. .

  In this configuration, when the telescopic frame 18 is inserted into the guide frame 17 during manufacture or assembly, the boss 21b at the tip of the piston rod of the telescopic cylinder 21 is guided by the guide groove 40a, and the boss receiving portion 40b abuts. At this time, the positions of the pin holes of the boss 21b at the tip of the piston rod coincide with the positions of the pin holes 41 and 42 of the upper and lower plate portions 18c and 18b of the telescopic frame 18 and the pin holes of the bosses 43 and 44.

  In this telescopic track frame, during the operation of the construction machine, the telescopic cylinder 21 is in an extended state, as shown for each left side frame 19 in FIGS. At this time, the lock pin 33 is inserted into the pin hole 36 provided in the guide frame 17 and the pin hole 34 provided in the extendable frame 18 (see FIG. 6) to prevent the extendable frame 18 from expanding and contracting.

  When the left and right side frames 19 are separated from the center frame 16 together with the crawler belts 27, the jack 60 is set under the center frame 16 side (including the guide frame 17) as shown in FIG. Then, the bolt 30 is removed, the telescopic frame 18 is removed from the side frame 19, the jack 60 is extended, the center frame 16 is slightly floated together with the upper revolving body etc. thereon, the telescopic cylinder 21 is contracted, and the telescopic frame 18 is Shrink as shown. The illustrated example shows an example in which the extremity frame 18 slightly remains on the side frame 19 in the state in which the expansion frame 18 is most contracted.

  As described above, when the telescopic frame 18 is contracted, when the wire rope 61 is hung on the side frame 19 and lifted by a crane, the side frame 19 is suspended together with the crawler belt 27 and the like only by moving the side frame 19 slightly horizontally. Can be raised. For this reason, when the side frame 19 is separated together with the crawler belts 27 and the like, the space on the construction machine side for separation may be a space slightly larger than the installation space in the widened state of the construction machine, and the work space for separation. Is narrow. Further, at the time of separation, there is no need to horizontally move the side frame 53 while accurately controlling the posture with respect to the guide frames 51 and 57 of the center frame 50 as in the conventional telescopic track frame shown in FIGS. Separation becomes easy.

  Further, when the side frame 19 is assembled to the center frame 16 and assembled, the side frame having the crawler belt 27 suspended by a crane with the center frame 16 placed on the jack 60 or the support means on the stand in FIG. 19 is placed near the center frame 16. Then, the telescopic frame 18 may be extended by the telescopic cylinder 21 and the flange 32 serving as the connecting portion at the tip of the telescopic frame may be fastened with the bolt 30 according to the mounting seat 31 that is the side frame 19 side connecting portion.

  Here, the position adjustment of the side frame 19 with respect to the telescopic frame 18 can be performed using a crane or a lever. As in the case of separation, it is sufficient that there is a space slightly larger than the space of the widened construction machine, and the side frame is horizontally moved while accurately controlling the posture by a crane as in the conventional case. There is no need, and assembly becomes easy. For this reason, the time required for the separation and assembly of the side frame 19 and the center frame 16 can be reduced to about half.

  Further, in the present embodiment, when the telescopic frame 18 is inserted into the guide frame 17 in a state where the telescopic cylinder 21 is extended, that is, in a state where the boss 21b protrudes outside the guide frame 17, The boss 21b at the tip of the piston rod is guided in the guide groove 40a, and the telescopic frame 18 stops in a state where the boss 21b is in contact with the boss receiving portion 40b. At this time, the position of the pin hole of the boss 21b at the tip of the piston rod coincides with the position of the pin holes 41 and 42 of the upper plate portion 18c and the lower plate portion 18b of the telescopic frame 18 and the pin holes of the bosses 43 and 44. For this reason, the insertion work of the pin 23 to the expansion-contraction frame 18 of a piston rod can be performed quickly and easily. For this reason, the assembly of the telescopic frame 18 to the guide frame 17 in the manufacturing process can be performed easily and quickly. If the telescopic frame 18 is separated and transported from the side frame 19 and the center frame 16, the assembly work of the track frame 15 can be performed easily and quickly.

  FIG. 9 is a view corresponding to FIG. 8 showing another embodiment of the present invention. In this embodiment, the center frame 16 is supported on the ground by a support means such as a jack 60 in the maximum widened state of the side frame 19, the telescopic frame 18 is separated from the side frame 19, and then the telescopic frame 18 is contracted. In this state, the stroke length of the stretchable frame 18 is set so that a space X is formed between the side frame 19 or the crawler belt 27 protruding from the center frame 16 side and the stretchable frame 18. .

  9, when the telescopic frame 18 is separated and contracted from the side frame 19 and the side frame 19 is lifted together with the crawler belt 27 by a crane via a wire rope (not shown), the side frame 19 or The telescopic frame 18 does not interfere with the vertical movement of the crawler belt 27. For this reason, when separating the side frame 19, the side frame 19 can be pulled up directly by the crane, and the horizontal movement operation of the side frame 19 by the crane can be made unnecessary. Therefore, separation and assembly operations are easier.

  In addition to buckets, the construction machine of the present invention is a breaker that vibrates a chisel to break concrete structures, etc., a cage-like crushing tool that breaks and cuts concrete and reinforcing bars, and objects. Other work tools such as a gripping tool can be used by being attached to the work attachment 6 according to the work purpose.

It is a side view which shows an example of the hydraulic shovel which shows one Embodiment of the expansion-contraction track frame of this invention. It is a partial cross section top view which shows the combination structure of the center frame and side frame of this Embodiment. It is a side view of the lower traveling body of this embodiment. It is a front view which shows the combined structure of the center frame and side frame of this embodiment. It is a longitudinal cross-sectional view of FIG. FIG. 3 is a partially enlarged view of FIG. 2. It is the elements on larger scale of FIG. It is a partial front view explaining the isolation | separation operation | work of the track frame of this embodiment. It is a partial front view which shows other embodiment of this invention in the isolation | separation operation | work of a track frame. It is a top view which shows an example of the conventional track frame. It is a top view which shows the other example of the conventional track frame. FIG. 11 is a front view for explaining the separation work of the track frame shown in FIG. 10. It is a top view explaining the moving distance of the side frame in the separation of the track frame shown in FIG.

Explanation of symbols

  1: Lower traveling body, 2: Upper turning body, 3: Turning device, 4: Hydraulic power unit, 5: Driver's cab, 6: Working attachment, 7: Boom, 8: Boom cylinder, 9: Arm, 10: Arm cylinder , 12: bucket, 13: bucket cylinder, 14: link mechanism, 15: track frame, 16: center frame, 17: guide frame, 17a: side plate portion, 18: telescopic frame, 18a: side plate portion, 18b: lower plate portion 18c: upper plate part, 19: side frame, 21: telescopic cylinder, 22, 23: pin, 25: drive sprocket, 26: driven wheel, 27: crawler belt, 29: roller, 30: bolt, 31: mounting seat, 32: flange, 33: lock pin, 34, 35, 36: pin hole, 40: guide member, 40a: guide groove, 40b: boss receiving part, 41, 42: pin hole, 3,44: boss, 60: jack

Claims (3)

In the telescopic track frame constituting the lower traveling body of a construction machine comprising a lower traveling body, an upper swing body on the lower traveling body, and a work attachment attached to the upper swing body,
A center frame on which the upper swing body is installed;
A guide frame having a rectangular tube shape provided in the left-right direction on each of the front and rear sides of the center frame;
A telescopic frame having a rectangular tube shape that fits in the left and right directions from the front and rear guide frames.
A telescopic cylinder, housed in the telescopic frame and the guide frame, for extending and contracting the telescopic frame with respect to the guide frame;
A telescopic track frame, comprising: side frames disposed on the left and right sides of the center frame, to which the telescopic frame is detachably attached by bolts. The telescopic track frame according to claim 1,
The center frame is supported in a state where the side frame is in the maximum widened state by a support means while being separated from the ground, the bolt connection between the telescopic frame and the side frame is released, and then the telescopic frame is contracted, An expansion / contraction track frame, wherein the expansion / contraction stroke of the expansion / contraction frame is set so that the frame does not interfere with the side frame. The telescopic track frame according to claim 1 or 2,
The telescopic cylinder has a bottom side end connected to the guide frame side, a piston rod connected to the telescopic frame side,
Provided in the vicinity of the piston rod connecting portion of the telescopic cylinder on the lower plate portion of the telescopic frame is a guide member having a tapered guide groove in which the telescopic cylinder side is enlarged,
Pin holes are provided at locations corresponding to the outermost boss receiving portions in the guide grooves in the upper and lower plate portions of the telescopic frame,
When the telescopic frame is inserted into the guide frame and the boss receiving portion comes into contact with the boss at the tip of the piston rod of the telescopic cylinder, the position of the pin hole of the boss at the tip of the piston rod is above the telescopic frame. An extendable track frame characterized by having a configuration that matches the positions of pin holes in the plate portion and the lower plate portion.

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