JP6095938B2 - Crawlers and construction machinery - Google Patents

Description

  More particularly, the present invention relates to a crawler suitable for a large construction machine in which a plurality of crawler shoes are connected endlessly and a rubber pad is detachably attached to the outer surface of the crawler shoe. Related to construction machinery.

  In general, metal crawlers used in various construction machines hang a link member connected in the form of a roller chain between sprocket wheels and idler wheels arranged at both front and rear ends, and the outer periphery of the link member. The shoe has a structure in which the shoe is detachably attached. Further, a rubber pad is formed on the outer surface (grounding surface side) of the shoe so as to protect the paved road surface (see, for example, Patent Document 1).

JP 20041366753 A

  In the case of a construction machine where the work location is not specified, such as a relatively small backhoe, a rubber pad can be attached to the outer surface of the shoe in consideration of work and running on the paved road surface. Even if it is, it is designed so that it does not exceed the transport limit height even if it is loaded on the carrier with the rubber pad attached.

  On the other hand, large construction machines, such as large pile drivers and cranes, have to perform pile driving work in a stable state, so work is performed in a place where a laid iron plate is laid. It is not assumed that the vehicle will run, and the overall height is less than the restricted transport height with the outer surface of the shoe in contact with the ground. Therefore, if a rubber pad is attached to the outer surface of a crawler that is provided as a standard in the pile driving machine in order to obtain quietness during traveling, the transport limit height may be exceeded when it is placed on the trailer platform. is there. In this case, the rubber pad had to be removed from at least the portion of the shoe to be grounded before transportation, and the work of attaching the rubber pad again had to be performed after transportation.

  Accordingly, the present invention provides a crawler having a structure capable of suppressing the overall height to less than the transportation limit height even when a rubber pad is attached, and capable of reliably transmitting the driving force during traveling to the rubber pad, and the crawler. The purpose is to provide large construction machines.

In order to achieve the above object, the crawler of the present invention is a crawler in which a plurality of metal crawler shoes are connected endlessly by link pins, and a rubber pad is detachably attached to the outer surface of the crawler shoe. shoe includes a rectangular substrate having a long side and the vehicle front-rear direction of the short sides of the vehicle body width direction, it protrudes from each long side of the substrate, coupling part connected by the link pin next contact crawler shoe A pair of rubber pad holding pieces projecting in the direction of the substrate outer surface along each long side of the substrate , and an intermediate projecting in a direction parallel to the rubber pad holding piece between the pair of rubber pad holding pieces a holding piece, and the engaging projection projecting from the inner surface central portion of the substrate, respectively formed on the inner surface of the short side ends of the substrate, a rubber pad fixed Bol leading to the short side Includes a mounting recess, and a bolt insertion hole provided to each rubber pad fixing bolt attachment recess, the rubber pad is provided on an outer surface of the rubber pad, the projecting end of the rubber pad holding piece and the intermediate holding piece Two protrusions in the width direction of the vehicle body that fit into two recesses formed by the grounding portion protruding outward and the pair of rubber pad holding pieces and the intermediate holding piece formed on the inner surface of the rubber pad. A rubber pad fixing bolt inserted into the bolt insertion hole, embedded in a position corresponding to the bolt insertion hole, and the rubber pad fixing protruding from the bolt insertion hole to the inner surface of the rubber pad fixing bolt mounting recess And a nut that is screwed onto the tip of the bolt .

Further, the connecting portion is located at a position where the two wide first engaging convex portions projecting from one long side and the two first engaging convex portions on the other long side are sandwiched from both sides, respectively. And a pin insertion hole penetrating in the vehicle width direction of the crawler shoe in the first engagement protrusion and the second engagement protrusion. Each of the other roller shoes adjacent to the first engaging convex portion of one of the adjacent crawler shoes is formed outside the second engaging convex portion that is respectively formed and located at both ends of the crawler shoe in the vehicle width direction. A through hole for attaching a link pin retaining bolt that comes into contact with an end portion of the link pin inserted into the pin insertion hole in the meshed state with the second engaging convex portion and prevents the link pin from coming off. That each of the formed protrusions is provided. It is a symptom. Furthermore, the construction machine according to the present invention is a construction machine equipped with such a crawler.

  According to the crawler of the present invention, the connecting portion protruding in the front-rear direction from the substrate without using the link member is connected by the link pin, and the rubber pad is fitted between the rubber pad holding pieces protruding from the outer surface of the substrate. Since they are held in the combined state, not only can the height be kept low by the amount of the link member, but also the driving force can be efficiently and reliably transmitted to the rubber pad. Therefore, in a large construction machine wearing such a crawler, even if a rubber pad is attached to the crawler, the total height does not exceed the transport limit height. In addition, since the driving force is received by the concave and convex fitting, the load on the rubber pad fixing bolt can be reduced, and the distance from the rubber pad grounding surface to the connecting part and link pin can be shortened, so the burden on these can be reduced. Can do. In addition, the rubber pad can be more reliably held by providing the intermediate holding piece. Further, since the link member can be omitted, the number of parts and the manufacturing cost can be reduced.

It is II sectional drawing of FIG. It is a principal part fragmentary sectional view of the crawler which shows one example of this invention. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a side view which shows an example of the construction machine using the crawler of this invention.

  1 to 4 show an embodiment in which the crawler of the present invention is applied to a lower traveling body of a pile driving machine which is one of large construction machines. A pile driving machine 21 shown in FIG. 4 includes, as a base machine, a lower traveling body 22 provided with a crawler 11 and an upper revolving body 23 provided on the lower traveling body 22 so as to be able to swivel. A leader arm 23a for mounting a reader (not shown) is provided at the front of the revolving structure 23, and a handrail 23b is detachably provided on the ceiling of the upper revolving structure 23.

  A pair of left and right traveling frames 25 are detachably attached to the arms 24, 24 projecting from both side surfaces of the main body of the lower traveling body 22. A sprocket wheel 26 serving as a drive wheel is provided at the rear end portion of the traveling frame 25, and an idler wheel 27 for adjusting the tension of the crawler 11 is provided at the front end portion of the traveling frame 25. A plurality of rolling wheels 28 having a suspension mechanism are provided at the lower part of the traveling frame 25, and a plurality of guide members 25a are provided at the upper part.

  The crawler 11 is formed by connecting a plurality of crawler shoes 12 made of metal endlessly with link pins 13 and hung around a sprocket wheel 26 and an idler wheel 27. The long side 12a is connected to the rectangular board 12c having the short side 12b in the longitudinal direction of the vehicle body, and the crawler shoe 12 protruding in the front-rear direction from the long side 12a side of the board 12c by the link pin 13. And a pair of rubber pad holding pieces 12e, 12e projecting in the direction of the substrate outer surface along the long sides 12a of the substrate 12c, and projecting from the center of the inner surface of the substrate 12c. Rubber pad fixing bolt mounting recesses 12g and 12 formed on the inner surface of the engagement protrusion 12f and the short side 12b end of the substrate 12c, respectively. It is equipped with a door. An intermediate holding piece 12h is provided between the rubber pad holding pieces 12e and 12e in parallel therewith, and a bolt insertion hole 12i is provided in each rubber pad fixing bolt mounting recess 12g.

  The connecting portion 12d has two wide first engaging convex portions 12k and 12k protruding from one long side 12a, and the other long side at a position where the first engaging convex portions 12k and 12k are sandwiched from both sides. 12a and 4m, and a pin insertion hole 12n penetrating in the width direction is formed in each of the engagement protrusions 12k and 12m. Yes. Further, a projecting piece 12p corresponding to the outer shape of the second engaging convex portion 12m is provided at the center lower portion of the long side 12a, and on the outer side of the second engaging convex portion 12m located at both ends in the width direction. Is provided with a projecting piece 12r having a through hole 12q for attaching the link pin retaining bolt 14.

  The crawler shoe 12 is connected by inserting the first engaging convex portions 12k protruding from the adjacent crawler shoes 12 into the two concave portions 12s formed between the second engaging convex portions 12m and 12m. With the mating projections engaged, the link pin 13, 13 is inserted into the pin insertion hole 12n from both sides, and the link pin retaining bolt 14 inserted through the through hole 12q is screwed with a nut to link This is done by preventing the pin 13 from coming off. The crawler 11 assembled to the traveling frame 25 is driven by the engagement projection 12f engaging with the engagement recess 26a of the sprocket wheel 26, and the engagement projection 12f is driven by the idler wheel 27, the wheel 28, and the guide member 25a. Guided by a groove (not shown), the outer periphery of the traveling frame 25 is circulated.

  The rubber pad 15 that is detachably attached to the outer surface of the crawler shoe 12 is formed of synthetic rubber such as urethane. The rubber pad holding pieces 12e and 12e and the intermediate holding member are provided on the inner surface that is the anti-ground surface side. Concavities and convexities corresponding to the concavities and convexities formed by the pieces 12h, that is, the two convex portions 15a and the intermediate holding pieces 12h that are inserted into the two concave portions 12t and 12t in the width direction formed on the outer surface of the crawler shoe 12 are inserted. Engaging grooves 15b are provided, and rubber pad fixing bolts 16 inserted into the bolt insertion holes 12i are embedded in both ends in the width direction of the respective convex portions 15a. Further, the outer surface of the rubber pad 15 is provided with a grounding portion 15c that protrudes outward from the protruding ends of the rubber pad holding pieces 12e and 12e and the intermediate holding piece 12h.

  The rubber pad 15 is configured such that the rubber pad fixing bolt 16 is inserted into the bolt insertion hole 12i, the convex portions 15a are inserted into the concave portions 12t, and the nut 16a is fastened to the rubber pad fixing bolt 16 protruding from the bolt insertion hole 12i. Accordingly, the crawler shoe 12 is mounted in an unevenly fitted state on the outer surface. At this time, since the rubber pad fixing bolt mounting recess 12g is formed at the end of the substrate 12c, the rubber pad fixing bolt 16 and the nut 16a do not protrude toward the inner peripheral side of the crawler 11.

  In a state where the rubber pad 15 is mounted on the outer surface of the crawler shoe 12, the convex portion 15a of the rubber pad 15 is fitted into the concave portion 12t formed by the rubber pad holding pieces 12e and 12e and the intermediate holding piece 12h. The driving force from the crawler shoe 12 can be efficiently transmitted to the rubber pad 15 with almost no load applied to the rubber pad 15. Furthermore, since the connecting portion 12d projects linearly before and after the substrate 12c, the driving force from the sprocket wheel 26 can be efficiently transmitted to each crawler shoe 12 via the link pin 13.

  Moreover, since the link member is not provided on the inner peripheral side of the crawler 11, the overall height of the pile driving machine 21 when the rubber pad 15 is attached is made lower than when the rubber pad is attached to the crawler having a conventional structure. Can do. Thereby, by removing a leader, a handrail, etc., the total height of the pile driving machine 21 can be suppressed to less than the transportation restriction height, and the pile driving machine 21 can be loaded and transported on the loading platform of the low floor trailer. Moreover, since it is possible to cope with the mounting of the rubber pad 15 only by changing the structure of the crawler 11, it is not necessary to make a design change of the upper swing body 23 that may be accompanied by a change in the arrangement of various devices. It becomes possible to correspond to the pile driver. Furthermore, the crawler of this invention is applicable not only to the said pile driver but to various large sized construction machines.

  DESCRIPTION OF SYMBOLS 11 ... Crawler, 12 ... Crawler shoe, 12a ... Long side, 12b ... Short side, 12c ... Substrate, 12d ... Connection part, 12e ... Rubber pad holding piece, 12f ... Engagement protrusion, 12g ... Concave part for attaching rubber pad fixing bolt, 12h ... intermediate holding piece, 12i ... bolt insertion hole, 12k ... first engagement convex part, 12m ... second engagement convex part, 12n ... pin insertion hole, 12p ... projection piece, 12q ... through hole, 12r ... projection piece, 12s ... concave portion, 12t ... concave portion, 13 ... link pin, 14 ... link pin retaining bolt, 15 ... rubber pad, 15a ... convex portion, 15b ... engagement groove, 15c ... grounding portion, 16 ... rubber pad fixing bolt, 16a ... nut , 21 ... Pile driver, 22 ... Traveling part, 23 ... Upper turning body, 23a ... Leader arm, 23b ... Handrail, 24 ... Arm, 25 ... Traveling frame, 25a ... Guide member, 26 ... Sprocket Door wheel, 26a ... engaging recess, 27 ... idler wheel, 28 ... track roller

Claims (3)

In a crawler in which a plurality of metal crawler shoes are connected endlessly with a link pin, and a rubber pad is detachably attached to the outer surface of the crawler shoe.
The crawler shoe is a rectangular substrate having a long side and the vehicle front-rear direction of the short sides of the vehicle body width direction, it protrudes from each long side of the substrate, are connected by the link pin next contact crawler shoe A connecting portion, a pair of rubber pad holding pieces projecting in the direction of the substrate outer surface along each long side of the substrate, and a pair of rubber pad holding pieces projecting in a direction parallel to the rubber pad holding piece. Intermediate holding pieces, engaging protrusions projecting at the center of the inner surface of the substrate, and recesses for mounting rubber pad fixing bolts that are formed on the inner surfaces of both ends of the short side of the substrate and reach the short side, A bolt insertion hole provided in each rubber pad fixing bolt mounting recess,
The rubber pad is provided on the outer surface of the rubber pad, the grounding portion protruding outward from the protruding end of the rubber pad holding piece and the intermediate holding piece, and the pair of rubber pad holding formed on the inner surface of the rubber pad. Two protrusions in the vehicle body width direction that fit into the two recesses formed by the piece and the intermediate holding piece, and the bolt insertion holes embedded in the positions corresponding to the bolt insertion holes , respectively. A crawler comprising: a rubber pad fixing bolt; and a nut screwed to a tip of the rubber pad fixing bolt protruding from the bolt insertion hole to an inner surface of the rubber pad fixing bolt mounting recess . The connecting portion protrudes to a position where the two wide first engaging convex portions projecting from one long side and the two first engaging convex portions of the other long side are sandwiched from both sides, respectively. There are four narrow second engaging convex portions, and pin insertion holes that penetrate the crawler shoe in the vehicle width direction are formed in the first engaging convex portion and the second engaging convex portion, respectively. And
The second engagement of the other roller shoe adjacent to the first engagement convex portion of one of the adjacent crawler shoes outside the second engagement convex portion respectively located at both ends of the crawler shoe in the vehicle width direction. A projecting piece having a through hole for attaching a link pin retaining bolt that comes into contact with an end of the link pin inserted into the pin insertion hole in a state of meshing with the mating convex portion and prevents the link pin from coming off crawler of claim 1 but which is characterized in <br/> that are provided.   A construction machine comprising the crawler according to claim 1.

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