JP2012219444A - Extensible truck frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extensible truck frame for a work machine having a retractable lower traveling structure, which prevents abrasion of a guide cylinder disposed at a center frame and a cylindrical frame disposed at a side frame, and allows a worn sliding surface to be repaired in a short time at low cost.SOLUTION: Stationary-side sliding members 11A to 11C are detachably fixed to the top and bottom faces in a guide cylinder 4. Movable-side sliding members 12A to 12C in slidable contact respectively with the stationary-side sliding members 11A to 11C disposed at the top and bottom faces in the guide cylinder 4 are detachably fixed to the top and bottom faces of a cylindrical frame 6 to be fixed to a side frame. Either one group of the stationary-side sliding members 11A to 11C or the movable-side sliding members 12A to 12C is made from a material having smaller size and higher abrasion resistance than another group.

Description

  The present invention relates to a telescopic structure constituting a lower traveling body in a working machine such as a hydraulic excavator, a crane or an applied machine in which an upper swing body is installed on a lower traveling body and a work device is attached to the upper swing body. It relates to an expression track frame.

  In a working machine in which an upper swinging body is installed on the lower traveling body and various working devices are attached to the upper swinging body, between the left and right crawler belts constituting the lower traveling body in order to stabilize the working machine during work. Some have adopted a telescopic track frame that is wide and has a stable posture and is reduced in width and reduced in space required for transportation during transportation or in a narrow field.

  The conventional telescopic track frame of the lower traveling body in such a working machine, as shown in Patent Document 1, for example, is provided with guide cylinders facing left and right respectively before and after the center frame where the upper swing body is installed on the upper surface, On the other hand, the left and right side frames to which the crawler belt is attached are provided with cylindrical frames protruding inward on the front and rear sides thereof, and these cylindrical frames are slidably fitted in the guide cylinders of the center frame. Is done.

JP 2003-182653 A

  According to the configuration of the telescopic track frame including the center frame and the side frame described in Patent Document 1, sliding between the guide cylinder provided on the center frame and the cylindrical frame provided on the side frame is performed by repeating the expansion / contraction operation using the hydraulic cylinder. There was a possibility that the moving surface was worn and rattled. When this rattling occurs, it is necessary to repair the sliding surface by overlay welding and polishing. However, repair work by welding or polishing is not easy, and there are problems that repair costs and time are required.

  In view of the above problems, the present invention prevents the wear of the guide tube provided on the center frame and the cylindrical frame provided on the side frame in the working machine having the expansion / contraction type lower traveling body, and repairs by wear of the sliding surface. An object of the present invention is to provide a telescopic track frame that can be performed in a short time and at a low cost.

The telescopic track frame of claim 1
A guide cylinder having a rectangular section provided at the front and rear of the center frame, comprising: a center frame for installing the upper swing body of the work implement; and a side frame provided on the left and right of the center frame to which a traveling drive device and a crawler belt are attached. In the telescopic track frame formed by fitting the cylindrical frame having a rectangular cross section attached to the side frame so as to be stretchable,
A stationary side sliding member is detachably attached to the upper and lower surfaces in the guide cylinder,
A movable side sliding member that slides in contact with and slides on a stationary side sliding member provided on the upper and lower surfaces in the guide tube is detachably attached to the upper and lower surfaces of the cylindrical frame,
One of the stationary side sliding member and the movable side sliding member is made of a material that is smaller in size than the other and has high wear resistance.

The telescopic track frame according to claim 2 is the telescopic track frame according to claim 1,
The movable side sliding member is made of a material having a smaller size and thickness than the stationary side sliding member and having high wear resistance,
A part of the movable side sliding member is accommodated and attached to a recess provided on the upper and lower surfaces of the movable side sliding member.

The telescopic track frame according to claim 3 is the telescopic track frame according to claim 1 or 2,
The movable side sliding member is made of a material having a smaller size and higher wear resistance than the stationary side sliding member,
Around each of the left and right sides of the guide cylinder, a set of two reinforcing frames provided with a gap in the sliding direction of the cylindrical frame is provided, respectively.
The position of at least one movable-side sliding member provided on the cylindrical frame at the reduced width position where the cylindrical frame is immersed in the guide cylinder and the expanded position where the cylindrical frame protrudes from the guide cylinder is the guide cylinder. The movable-side sliding member is arranged so that the position corresponding to one of the two reinforcing frames provided on both sides of the frame is shifted from the position corresponding to one reinforcing frame to the position corresponding to the other reinforcing frame.

  According to the first aspect of the present invention, stationary side sliding members are attached above and below the inner surface of the guide cylinder, and movable side sliding members that are in contact with and slide on the stationary side sliding member are provided on the upper and lower surfaces of the cylindrical frame. Therefore, it is possible to prevent the guide tube and the cylindrical frame itself from being worn. And if the sliding member wears out, backlash can be eliminated by adjusting the gap between the sliding members with a shim or by replacing the sliding member. Compared to the conventional overlay welding and polishing Thus, the time required for repair can be shortened, and the cost can be reduced.

  Further, among the stationary side sliding member and the movable side sliding member, the size of the relatively expensive sliding member having high wear resistance is reduced, and the relatively inexpensive sliding member having relatively low wear resistance is used. Since the size is increased, an increase in the cost of the track frame can be suppressed without increasing the total price of the sliding members.

  In addition, since two types of sliding members with different wear resistance are used, the sliding member that is relatively easy to wear, that is, the sliding member that is available at a relatively low cost, is a sliding member with high wear resistance. The possibility of replacement is higher than that of the member, and the material cost required for replacement can be reduced. This also contributes to the reduction of the repair cost.

  The invention according to claim 2 uses a member having high wear resistance for the movable side sliding member, and a part of the concave portion provided on the upper and lower surfaces of the cylindrical frame by making the plate thickness thinner than the stationary side sliding member. Since it accommodated and attached, the area of the cross section perpendicular | vertical to the expansion-contraction direction of a cylindrical frame can be taken large, and the intensity | strength of a cylindrical frame can be kept high.

  According to a third aspect of the present invention, the movable side sliding member is formed of a sliding member having high wear resistance, and the movable side sliding member is provided with a reinforcing frame provided around the guide cylinder in the reduced width state and the widened state, respectively. Since the movable side sliding member is arranged so that it is in the position, the load of the work machine in the part beyond the center frame and the load generated by the work are transmitted to the side frame through the reinforcement frame, and the track has high strength A frame can be realized.

It is a perspective view showing one embodiment of a telescopic track frame of the present invention. It is a top view which shows the expansion-contraction type track frame of this Embodiment. It is AA sectional drawing of FIG. It is an expanded sectional view which shows the structure of the right half part in FIG. It is an expanded sectional view which shows the structure of the left half part in FIG. It is an expanded sectional view which shows the structure of the upper sliding part in FIG. It is an expanded sectional view which shows the structure of the lower sliding part in FIG. It is BB sectional drawing of FIG.

  FIG. 1 is a perspective view showing an embodiment of the telescopic track frame of the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a sectional view taken along line AA of FIG. This telescopic track frame is used in a hydraulic excavator, a crane, or a dismantling machine, a scrap processing machine, a pile driving machine, and other working machines whose working front and work tools are changed.

  The telescopic track frame includes a center frame 1 and a side frame 2. The center frame 1 has a base 3 on which a turning frame (none of which is shown) that constitutes the upper turning body of the work implement is installed. In addition, guide cylinders 4 and 4 having a rectangular cross-sectional shape are integrally provided before and after the center frame 1. 5A and 5B are reinforcing frames attached by bolting or welding so as to surround the outer periphery of the guide cylinder 4. These reinforcing frames 5A and 5B are provided on the left and right sides of the guide cylinder 4 with two reinforcing frames 5A and 5B provided at intervals in the left-right direction as one set.

  The side frame 2 has a driving wheel and a hydraulic motor (not shown) for rotating the driving wheel attached to the rear part 2a, and a driven wheel (not shown) attached to the front part 2b. A crawler belt (not shown) is wound around a driven wheel via a roller (not shown). Reference numeral 6 denotes a cylindrical frame that is movably fitted in the guide cylinder 4. The cylindrical frame 6 has a rectangular cross-sectional shape. The cylindrical frame 6 of this example has a flange 6 a at the end, and the flange 6 a is fixed to the side frame 2 by bolts 7.

  In FIG. 3, 8 is a hydraulic cylinder that expands and contracts the lower traveling body by moving the side frame 2 close to and away from the center frame 1. The hydraulic cylinder 8 has a bottom end connected to the center of the guide cylinder 4 by a pin 9, and a piston rod end connected to a pin 10 to be inserted into the cylindrical frame 6 via a spherical bearing 10a. . In FIG. 3, the right cylindrical frame 6 and the hydraulic cylinder 8 show a reduced width state, and the left side shows a widened state. The reason why the spherical bearing 10a is used for the connection of the hydraulic cylinder 8 is to avoid a bending force or the like from acting on the hydraulic cylinder 8 due to the up / down / left / right movement accompanying the expansion / contraction operation of the cylindrical frame 6. The hydraulic cylinder 8 may be provided outside the guide cylinder 4 instead of inside the guide cylinder 4.

  4 and 5 are enlarged views of the right half and the left half of FIG. 3, respectively. In these figures, 11A and 11B are stationary sides attached to the inner surface of the upper plate portion 4a of the guide tube 4. It is a sliding member. 11C is a stationary side sliding member attached to the inner surface of the lower plate portion 4b of the guide cylinder 4. Reference numeral 12A denotes a movable side sliding member which is attached to the upper surface of the upper plate portion 6b of the cylindrical frame 6 and slides in contact with the stationary side sliding members 11A and 11B as the cylindrical frame 6 expands and contracts. is there. 12B and 12C are movable side sliding members that are attached to the lower surface of the lower plate portion 6c of the cylindrical frame 6 and are slid by the stationary sliding member 11C as the cylindrical frame 6 expands and contracts.

  FIG. 6 is a view showing a mounting structure of the upper stationary sliding members 11A and 11B and the movable sliding member 12A. As shown in FIG. 6, the stationary-side sliding members 11 </ b> A and 11 </ b> B have screw holes 13, and mounting bolts 15 that pass through bolt insertion holes 14 provided in the upper plate portion 4 a of the guide tube 4 are screwed into the screw holes 13. These stationary-side sliding members 11A and 11B are attached to the inner surface of the upper plate portion 4a of the guide tube 4 by being fastened together. The movable sliding member 12A is attached by being fitted through a shim 17 into a recess 16 provided on the upper surface of the upper plate portion 6b of the cylindrical frame 6. The movable side sliding member 12A is held in the concave portion 16 by being sandwiched between the concave portion 16 and the stationary side sliding member 11A or 11B in both the reduced width state and the widened state.

  FIG. 7 is a view showing a mounting structure of the lower stationary sliding member 11C and the movable sliding members 12B and 12C. In FIG. 7, reference numeral 18 denotes a shim provided between the stationary side sliding member 11 </ b> C and the lower plate portion 4 b of the guide cylinder 4. The stationary side sliding member 11 </ b> C has a screw hole 19, and a bolt insertion hole 20 provided in the lower plate portion 4 b of the guide cylinder 4 and a mounting bolt 22 passed through the bolt insertion hole 21 provided in the shim 18 are formed in the screw hole 19. The stationary sliding member 11C and the shim 18 are attached to the inner surface of the lower plate portion 4b of the guide tube 4 by screwing and fastening.

  The movable-side sliding members 12B and 12C are fitted into recesses 23 provided on the lower surface of the lower plate portion 6c of the cylindrical frame 6 and are inserted into bolt insertion holes 24 provided in the lower plate portion 6c of the cylindrical frame 6. 25 is screwed into a screw hole 26 provided in the movable sliding members 12B and 12C and fastened to be attached to the lower surface of the lower plate portion 6c.

  In this embodiment, the stationary side sliding member 11C is divided into the front and rear two pieces as shown in FIG. 8 in order to facilitate the work at the time of attachment and replacement. Are installed. Specifically, if the stationary-side sliding member 11C is composed of a single plate material, the weight of the stationary-side sliding member 11C is about 50 kg. And can be handled easily. The reason why the upper stationary sliding member is divided into 11A and 11B is also to facilitate the work at the time of attachment and replacement.

  In the present embodiment, the movable-side sliding members 12A to 12C are smaller in size than the stationary-side sliding members 11A to 11C, that is, the plate surface area is small, and the plate thickness is also thin. Moreover, the movable side sliding members 12A to 12C are made of a member having superior wear resistance and high hardness and higher sliding properties than the stationary side sliding members 11A to 11C, and are preferably made of a special alloy. For example, when the Brinell hardness of the stationary side sliding members 11A to 11C is about 120 to 140, the movable side sliding members 12A to 12C having a Brinell hardness of 160 or more are used.

  As shown in FIG. 4, in the reduced width state in which the cylindrical frame 6 is immersed in the guide cylinder 4, the movable side sliding members 12 </ b> A and 12 </ b> C are positioned corresponding to the reinforcing frame 5 </ b> A. On the other hand, as shown in FIG. 5, in the widened state in which the cylindrical frame 6 protrudes from the guide cylinder 4, the movable side sliding members 12A and 12C are in positions corresponding to the reinforcing frame 5B, and the movable side sliding member. 12B is a position corresponding to the reinforcing frame 5A.

  In this track frame, when wear occurs due to the passage of operating time and a backlash occurs, this backlash can be eliminated by adjusting the clearance by adding or replacing shims 17 and 18. Further, when the wear further progresses and the clearance adjustment by the shims 17 and 18 becomes difficult, the backlash can be eliminated by exchanging the stationary sliding members 11A to 11C and the movable sliding members 12A to 12C.

  In the present embodiment, stationary side sliding members 11A to 11C are attached to the upper and lower sides of the inner surface of the guide cylinder 4, and the sliding is made in contact with the stationary side sliding members 11A to 11C on the upper and lower surfaces of the cylindrical frame 6. Since the side sliding members 12A to 12C are provided, wear of the guide cylinder 4 and the cylindrical frame 6 itself can be prevented. When the sliding members 11A to 11C and 12A to 12C are worn, the backlash is eliminated by adjusting the gap between the sliding members by the shims 17 and 18 or by replacing the sliding members 11A to 11C and 12A to 12C. Therefore, the time required for repair can be shortened and the cost required for repair can be reduced as compared with the case of conventional overlay welding or polishing.

  Moreover, among the stationary side sliding members 11A to 11C and the movable side sliding members 12A to 12C, the size of the relatively expensive sliding members 12A to 12C having high wear resistance is reduced, and the wear resistance is relatively high. Since the size of the low and relatively inexpensive sliding members 11A to 11C is increased, the increase in the cost of the track frame can be suppressed without increasing the total price of the sliding members.

  In addition, since two types of sliding members having different wear resistances are used, the sliding members that are relatively easy to wear, that is, the sliding members 11A to 11C that are available at a relatively low cost, are used for the wear resistance. The possibility of replacement from the high sliding members 12A to 12C is increased, and the material cost required for the replacement can be reduced. This also contributes to the reduction of the repair cost.

  When practicing the present invention, a sliding member having a large size and low wear resistance may be attached to the cylindrical frame 6 side, and a sliding member having a small size and high wear resistance may be provided on the guide cylinder 4 side. . However, as in the present embodiment, the sliding members 12A to 12C having higher wear resistance and smaller size and thickness than the stationary side sliding members 11A to 11C are provided on the upper and lower surfaces of the cylindrical frame 6. By adopting a structure that is partially housed in and attached to the recesses 16 and 23, the area of the cross section perpendicular to the expansion / contraction direction of the cylindrical frame 6 can be increased, and the strength of the cylindrical frame 6 can be kept high. Can do.

  Further, in the present embodiment, the movable side sliding members 12A to 12C are formed of a sliding member having high wear resistance, and the positions of the movable side sliding members 12A and 12C are in the contracted state and the expanded state. The movable side sliding members 12A to 12C are arranged so as to correspond to the position of the reinforcing frame 5A and the position of the reinforcing frame 5B, respectively, and the movable side sliding member 12C corresponds to the position of the reinforcing frame 5A in the widened state. Therefore, the load of the working machine in the portion above the center frame 1 and the load additionally generated by the work are transmitted to the side frame 2 through the reinforcing frames 5A and 5B, and a high-strength track frame can be realized.

  When the present invention is carried out, the shim for adjusting the distance between the movable sliding member 12A and the stationary sliding members 11A, 11B is the upper plate portion of the stationary sliding member 11A, 11B and the guide cylinder 4. It may be provided alone or with shim 17 between 4a. However, as shown in this embodiment, if the shim 17 is provided on the upper surface of the cylindrical frame 6, when the shim 17 is attached, it is not necessary for an operator to support the shim 17 from below. Installation is easy.

  Further, the shim for adjusting the distance between the movable side sliding members 12B and 12C and the stationary side sliding member 11C is provided between the movable side sliding members 12B and 12C and the lower plate portion 6c of the cylindrical frame 6 alone. Alternatively, it may be provided separately from the shim 18. However, as shown in this embodiment, if the shim 18 is provided between the stationary-side sliding member 11C and the lower plate portion 4b of the guide cylinder 4, when the shim 18 is attached, the operator can install the shim 18 by the operator. There is no need to support from below, and the shim 18 can be easily attached.

  Moreover, when implementing this invention, not only the said embodiment but a various change and addition are possible about the structure and combination of each part in the range which does not deviate from the summary of this invention.

1: Center frame, 2: Side frame, 3: Swivel unit base, 4: Guide cylinder, 5A, 5B: Reinforcement frame, 6: Cylindrical frame, 8: Hydraulic cylinder, 11A to 11C: Stationary sliding member , 12A to 12C: movable side sliding member, 15: mounting bolt, 16: recess, 17, 18: shim, 22: mounting bolt, 23: recess, 25: mounting bolt

Claims (3)

A guide cylinder having a rectangular section provided at the front and rear of the center frame, comprising: a center frame for installing the upper swing body of the work implement; and a side frame provided on the left and right of the center frame to which a traveling drive device and a crawler belt are attached. In the telescopic track frame formed by fitting the cylindrical frame having a rectangular cross section attached to the side frame so as to be stretchable,
A stationary side sliding member is detachably attached to the upper and lower surfaces in the guide cylinder,
A movable side sliding member that slides in contact with and slides on a stationary side sliding member provided on the upper and lower surfaces in the guide tube is detachably attached to the upper and lower surfaces of the cylindrical frame,
One of the stationary side sliding member and the movable side sliding member is made of a material having a smaller size and higher wear resistance than the other. The telescopic track frame according to claim 1,
The movable side sliding member is made of a material having a smaller size and thickness than the stationary side sliding member and having high wear resistance,
A telescopic track frame characterized in that a part of the movable side sliding member is accommodated in a recess provided on the upper and lower surfaces of the movable side sliding member. The telescopic track frame according to claim 1 or 2,
The movable side sliding member is made of a material having a smaller size and higher wear resistance than the stationary side sliding member,
Around each of the left and right sides of the guide cylinder, a set of two reinforcing frames provided with a gap in the sliding direction of the cylindrical frame is provided, respectively.
The position of at least one movable-side sliding member provided on the cylindrical frame at the reduced width position where the cylindrical frame is immersed in the guide cylinder and the expanded position where the cylindrical frame protrudes from the guide cylinder is the guide cylinder. The movable sliding member is arranged so that the position corresponding to one of the two reinforcing frames provided on both sides of the frame is changed from the position corresponding to the one reinforcing frame to the position corresponding to the other reinforcing frame. Track frame.

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