JP2007022260A - Support structure of lower roller for crawler type working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the maintenance cost by improving working efficiency in maintenance and inspection of a lower roller and exchange of the lower roller. <P>SOLUTION: A support shaft 14 of the lower roller 12 is supported by two roller support plates 13, 13A, a notch 13a is provided at the front and rear sides of the roller support plates 13, 13A, and a pair of horizontal guide members 11 having the notch 13 to be fitted are provided between an inside plate 6B and an outside plate 6A of a truck frame 6. The outside plate 6A of the truck frame 6 is provided with an opening part 6a wherein the roller support plates 13, 13A can be passed through, and the roller support plates 13, 13A are inserted sliding the guide member 11 and the notch 13a from the opening part 6a while the roller 12 is supported. After the roller support plate 13A of the inside is abutted to the inside plate 6B of the truck frame 6, the opening part 6a of the outside plate 6A is clogged by a pressing plate 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a support structure for a lower roller of a crawler working machine (hydraulic excavator).

  FIG. 7 is a side view of a hydraulic excavator of a small rear turning type. FIG. 8 is a perspective view of the lower traveling body of the hydraulic excavator. FIG. 9 is a partially enlarged view of the track frame in FIG. FIG. 10 is an exploded perspective view of the lower roller, showing the engagement between the roller bearing and the mounting bolt. 7 to 10, A is a hydraulic excavator, B is a lower traveling body, C is an upper swing body, and D is a boom type attachment. The lower traveling body B has a truck frame c attached to both side surfaces of a car body a incorporating a turning device and the like, and an idler wheel e and a drive sprocket d are attached to the front and rear ends of the truck frame c. The crawler f is suspended around a ring body such as a drive sprocket d. b is a canopy. The track frame c is composed of two plates, an outer plate c1 and an inner plate c2. Reference numeral g denotes a protrusion provided to face the lower end of the outer plate c1 and the inner plate c2 of the track frame c so as to protrude downward. 10, i is a lower roller, and as shown in FIG. 10, a ring-shaped protrusion i1 is provided at the center, and the protrusion i1 enters a groove q inside the crawler f. j is a support member for supporting the support shaft k of the lower roller i, m is a screw hole formed in the support member j, and is screwed to the bolt n. o is a washer and p is a grease nipple of the lower roller i.

  The lower roller i is fitted between the outer plate c1 of the track frame c and the protrusion g at the lower end of the inner plate c2, and both ends thereof are fixed from the outside with bolts n through the holes of the outer plate c1 and the inner plate c2. is doing.

  Next, an apparatus that suspends the crawler f and applies sufficient tension to the crawler f will be described. 11A and 11B are explanatory views of an apparatus for applying tension to the crawler, where FIG. 11A is a perspective view and FIG. 11B is a partial cross-sectional perspective view. In the figure, r is a spring, s is a grease cylinder, s1 is a piston, s2 is an O-ring, s3 is a backup ring, t is an idler fork, u is a check valve for preventing reverse flow of grease, and v is a grease nipple. Using a grease gun, the grease is fed into the grease cylinder s through the grease nipple v and the check valve u, and a sufficient tension is applied to the crawler f by extending the piston s1.

  Next, attachment / detachment of the crawler f will be described. FIG. 12 is an explanatory diagram when the crawler f is removed. First, as shown in FIG. 12 (A), when the upper turning body C is turned sideways and the attachment D is pushed down to the ground, one side of the lower traveling body B is lifted, so a base is placed under the car body a. Apply. Next, the check valve u shown in FIGS. 13B and 13C is gradually loosened to such an extent that the grease in the grease cylinder leaks out. If it is loosened suddenly at this time, high-pressure grease may jump out, which is dangerous. When the grease comes out, the tension of the crawler f is loosened. Therefore, as shown in FIG. 13A, the bar is inserted between the idler wheel e and the crawler f, and the bar is pushed down so that the crawler f is pulled forward. The crawler f is slowly rotated in the direction of the arrow in FIG. 13A to remove the crawler f from the idler wheel e. FIG. 13B shows a state in which the crawler f is detached from the idler wheel e. To attach the crawler f, the procedure is reversed.

  Patent Document 1 discloses an invention related to a track frame of a hydraulic excavator. The present invention divides the track frame into a front half and a rear half, and each half is pivotally supported via a horizontal shaft so that the excavator can be operated and operated in a rough road. It improves the sex. Since the impact on the lower roller is reduced, the service life is extended but maintenance is still necessary.

Japanese Patent Application 2000-142500

  To remove the lower roller i for maintenance, after removing the crawler f as described above or after sufficiently loosening the crawler f, remove the bolt n from the inside and outside of the track frame c to remove the lower roller i. Therefore, when removing the crawler f, the work efficiency is poor, the maintenance cost is increased, the stroke of the grease cylinder s must be increased to sufficiently loosen the crawler f, and the grease cylinder s is discharged to loosen it. Grease is wasted. To install the lower roller i, the procedure is reversed. Further, since the lower traveling body B of the excavator A is soiled by earth and sand or the like, the dirt is periodically discharged to clean the soil, but the head of the mounting bolt n of the lower roller i protrudes inside the track frame c. For this reason, the earth and sand collected on the upper surface of the head of the inner bolt n is difficult to wash even if water is discharged.

The present invention has been devised in view of such problems of the prior art, and when performing maintenance and inspection of the lower roller or replacement of the lower roller, the machine is lifted to slightly move the crawler by the height of the protrusion of the lower roller. Since the lower roller is loosened and the lower roller is attached / detached from the outside of the machine, the work efficiency is good, the maintenance cost can be reduced, and the bolts on the inner surface of the track frame are eliminated, making it easy to clean the earth and sand. An object of the present invention is to provide a mounting structure for a lower roller of a machine.

  To achieve the above object, the lower roller mounting structure of the crawler work machine according to the present invention is a plurality of attachments between the inner plate and the lower part of the outer plate of the track frame of the crawler work machine. Is a lower roller mounting structure of a crawler type work machine in which a ridge-shaped projection enters a groove on the inner side of the crawler and presses the crawler from above. A notch is provided on the front and rear sides of the roller support plate, and a pair of horizontal guide members on which the notch is fitted are provided between the inner and outer plates of the track frame. In addition, the outer plate of the track frame is provided with an opening through which the roller support plate can pass, and the roller support plate is inserted from the opening while supporting the roller. The notch and the guide member inserted sliding contact with, after contact with the inner side of the roller support plates inside plate of the truck frame, in which are so as to close the openings of the outer plate presser plate.

  It is preferable that the notch of the roller support plate has a rectangular shape with one side open, and the guide member also has a rectangular shape.

  It is preferable that the lower ends of the inner and outer plates of the track frame have escaped portions other than the lower roller support portion.

  Next, the operation of the present invention will be described. When removing the lower roller, first turn the upper swinging body to the side and push down on the attachment, so one side of the lower traveling body will be lifted, so place the base under the car body. Next, gradually loosen the check valve so that the grease in the grease cylinder leaks out. When the grease comes out, the crawler tension is loosened. Loosen the crawler so that the ring-shaped protrusions of the lower roller come out of the crawler groove. Next, the holding plate at the opening of the outer plate of the track frame is removed, and the lower roller is pulled out from the opening and removed. At this time, the lower roller is pulled out while sliding the notch provided in the support plate of the lower roller with a pair of horizontal guide members provided between the inner and outer plates of the track frame. To install the lower roller, reverse the above procedure, but insert the lower roller from the opening of the outer plate of the track frame while sliding in contact with the guide member, and the roller support plate inside the lower roller is attached to the inner plate of the track frame. After the contact, the opening of the outer plate is closed and fixed with a presser plate. In this way, the lower roller is attached to and detached from the outside of the machine into the track frame, so that the crawler looseness during attachment and detachment can be reduced, and the grease cylinder stroke is shortened to reduce the amount of wasted grease. can do. In addition, since the head of the bolt does not protrude inward of the inner plate of the track frame, dirt does not collect on the inner surface of the track frame, and cleaning is easy.

The lower roller mounting structure of the crawler working machine according to the present invention is such that when performing maintenance and inspection of the lower roller or replacement of the lower roller, the machine is lifted and the crawler is loosened to such an extent that the ring-shaped protrusion of the lower roller is removed from the crawler groove. Since the lower roller is attached / detached from the outside, the work efficiency is good, the maintenance cost can be reduced, and there is no bolt on the inner surface of the track frame, so it is easy to wash the earth and sand. .

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a hydraulic excavator having a lower roller mounting structure for a crawler working machine according to the present invention. FIG. 2 is a perspective view of the lower traveling body having the lower roller mounting structure of the present invention. FIG. 3A is a partially enlarged perspective view of the track frame of FIG. 2 and shows a state viewed obliquely from the outside. FIG. 3B is a perspective view showing a state in which the lower roller is taken out from the track frame. FIG. 4 is a partially enlarged perspective view of the track frame of FIG. FIG. 5 is a perspective view of the lower roller of the crawler type working machine of the present invention. 6 is a cross-sectional view taken along arrow AA in FIG. 1 to 6, reference numeral 1 denotes a hydraulic excavator. 2 is a lower traveling body of the excavator 1, 3 is an upper swing body, 4 is a boom attachment, and 5 is a car body. A track frame 6 is attached to both side surfaces of the car body 5. The track frame 6 is composed of two sheets, an outer plate 6A and an inner plate 6B. Reference numeral 6a denotes a plurality of openings provided on the outer side plate 6A, the lower side being open, through which a roller support plate of a lower roller described later can pass. Reference numeral 6b denotes a plurality of downward projecting portions provided on the inner plate 6B, which are provided at positions facing the opening 6a. 6c is a clearance provided at a lower end portion of the outer plate 6A and the inner plate 6B other than a lower roller support portion described later, that is, between each opening 6a of the outer plate 6A and between each protrusion 6b of the inner plate 6B. It is. 7 is a drive sprocket provided at the rear end of the track frame 6, and 8 is an idler wheel provided at the front end of the track frame 6. A crawler 9 is suspended around a ring body such as a drive sprocket 7 and an idler wheel 8. 9 a is a groove inside the crawler 9. Reference numeral 10 denotes a turning device provided on the upper surface of the car body 5 for turning the upper turning body 3.

  Reference numeral 11 denotes a guide member. As shown in FIG. 3A, a pair of horizontal members is provided between the inner plate 6B and the outer plate 6A in the opening 6a, and a lower roller (to be described later) is attached to and detached from the track frame 6. In doing so, the lower roller is guided and the lower roller fixing member after the lower roller is mounted. A screw hole 11 a is provided at the outer end of the guide member 11.

  Reference numeral 12 denotes a lower roller. As shown in FIG. 3B, FIG. 5 and FIG. 6, the lower roller 12 is provided with a ring-shaped protrusion 12a at the center so that the protrusion 12a enters the groove 9a inside the crawler 9. Yes. Reference numeral 12b denotes a grease nipple provided on the protrusion 12a. 12c is a bearing, 12d is a snap ring, 12e is a muddy water seal, and 12f is a spring. 13 and 13A are roller support plates attached to both sides of the lower roller 12, 13 is an outer side, and 13A is an inner side. 13a is a notch provided on the front and back sides of the roller support plates 13 and 13A. The notch 13a is fitted on the pair of guide members 11, and after the lower roller 12 is attached, the lower roller 12 is moved together with the guide member 11. Fix it. Reference numeral 14 denotes a support shaft of the lower roller 12, and both sides thereof are supported below the roller support plates 13 and 13A. Reference numeral 15 denotes a roller pressing plate. A hole 15 a is formed in the front and rear sides of the roller pressing plate 15 and is provided at a position facing the screw hole 11 a of the guide member 11. After the lower roller 12 is inserted into the track frame 6 from the opening 6a and the inner roller support plate 13A contacts the inner plate 6B of the track frame 6, the roller pressing plate 15 is applied to the opening 6a of the outer plate 6A. The bolt 16 is passed through the roller pressing plate 15 and screwed into a screw hole 11a provided at the outer end of the guide member 11 so as to close the opening 6a. The lower roller 12 is inserted into the track frame 6 while the roller support plates 13 and 13A of the lower roller 12 are in sliding contact with the guide member 11.

  Next, the operation of the embodiment of the present invention will be described. When removing the lower roller 12, first, the upper revolving unit 3 is turned sideways, and when the attachment 4 is pushed down, one side of the lower traveling unit 2 is lifted, so the base is placed under the car body 5. Next, the check valve u is gradually loosened to such an extent that the grease in the grease cylinder s leaks out. Since the tension of the crawler 9 is loosened when the grease comes out, the crawler 9 is loosened to such an extent that the ring-shaped protrusion 12a of the lower roller 12 is detached from the groove 9a of the crawler 9. Next, the holding plate 15 of the opening 6a of the outer plate 6A of the track frame 6 is removed, and the lower roller 12 is pulled out from the opening 6a and removed. At this time, the lower roller 12 slidably contacts a notch 13a provided on the support plates 13 and 13A of the lower roller 12 with a pair of horizontal guide members 11 provided between the inner plate 6B and the outer plate 6A of the track frame 6. It is pulled out while. In order to attach the lower roller 12, the reverse procedure is performed. The lower roller 12 is inserted in sliding contact with the guide member 11 from the opening 6 a of the outer plate 6 A of the track frame 6, and the roller support plate inside the lower roller 12 is inserted. When 13A comes into contact with the inner plate 6B of the track frame 6, the opening 6a of the outer plate 6A is closed by the press plate 15 and fixed. Thus, since the lower roller 12 is attached to and detached from the outside of the machine into the track frame 6, the looseness of the crawler 9 when attaching and detaching can be reduced, and the stroke of the grease cylinder s can be shortened to waste the grease. The amount to do can be reduced. Further, since the head of the bolt does not protrude inward of the inner plate 6B of the track frame 6, earth and sand do not collect on the inner surface of the track frame 6, and cleaning is easy.

  The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the gist of the present invention. For example, the shape of the notches 13a of the roller support plates 13 and 13A of the guide member 11 and the lower roller 12 may be trapezoidal or circular instead of the rectangular shape.

It is a side view of the hydraulic excavator which has the attachment structure of the lower roller of the crawler type work machine of this invention. It is a perspective view of the lower traveling body which has the attachment structure of the lower roller of the crawler type work machine of this invention. (A) is the elements on larger scale of the track frame of FIG. 2, (B) is a perspective view which shows the state which took out the lower roller from the track frame. FIG. 4 is a partially enlarged view of the track frame of FIG. It is a perspective view of the lower roller of the crawler type work machine of the present invention. It is AA arrow sectional drawing of FIG. It is a side view of a hydraulic excavator of a small rear turning type. It is a perspective view of the lower traveling body of a hydraulic excavator. It is the elements on larger scale of the track frame of FIG. It is a disassembled perspective view of a lower roller, and is a figure which shows engagement with a roller bearing and a mounting bolt. It is explanatory drawing of the apparatus which provides tension | tensile_strength to a crawler, (A) is a perspective view, (B) is a partial cross section perspective view. It is explanatory drawing when removing a crawler. It is explanatory drawing when removing a crawler.

Explanation of symbols

1 Working machine (hydraulic excavator)
2 Lower traveling body 3 Upper revolving body 4 Boom attachment 5 Car body 6 Track frame 6A Track frame outer plate 6B Track frame inner plate 6a Opening portion 6b Protruding portion 6c Escape 7 Drive sprocket 8 Idler wheel 9 Crawler 9a Groove 10 Turning Device 11 Guide member 11a Screw hole 12 Lower roller 12a Protrusion 13, 13A Roller support plate 13a Notch 14 Roller spindle 15 Presser plate 16 Bolt

Claims (3)

A plurality of crawler-type work machines are installed between the inner and lower plates of the track frame, and the ring-shaped protrusion at the center of the roller enters the groove inside the crawler to press the crawler from above. The lower roller mounting structure of the crawler working machine is supported by two inner and outer roller support plates, and notches are provided on the front and rear sides of the roller support plate. And a pair of horizontal guide members into which the notches are fitted are provided between the inner and outer plates of the track frame, and an opening through which the roller support plate can pass is provided on the outer plate of the track frame. The roller support plate is inserted from the opening while the roller is supported while the guide member and the notch are in sliding contact with each other, and the inner roller support plate is inserted into the track frame. After contact with the inner plate, the mounting structure of the lower roller of a crawler type working machine, characterized in that so as to block the opening of the outer plate presser plate. 2. The lower roller mounting structure for a crawler working machine according to claim 1, wherein the cutout of the roller support plate has a square shape with one open side, and the guide member also has a square shape. 2. The lower roller mounting structure for a crawler working machine according to claim 1, wherein the lower ends of the inner and outer plates of the track frame are escaped from portions other than the lower roller support portion.

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