JP4829091B2 - Tracked vehicle traveling body - Google Patents

Description

  The present invention relates to a traveling body of a tracked vehicle having a crawler track such as a hydraulic excavator or a hydraulic crane.

  In general, a tracked vehicle such as a hydraulic excavator or a hydraulic crane has a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and work provided on the upper revolving body. It is roughly constituted by the device.

  Here, for example, a lower traveling body of a large tracked vehicle includes a track frame having a center frame and side frames extending in the front and rear directions on both left and right sides of the center frame, and each side of the track frame. A drive tumbler provided on one side in the length direction of the frame; an idler provided on the other side in the length direction of each side frame; and a crawler belt wound around the drive tumbler and the idler; A lower roller provided on the lower surface side of the side frame for guiding the crawler belt between the drive tumbler and the idler, and a slider provided on the upper surface side of the side frame for guiding the crawler belt between the drive tumbler and the idler; (See, for example, Patent Document 1).

Japanese Patent Laid-Open No. 9-277964

  The lower traveling body according to Patent Document 1 rotates the drive tumbler to sequentially engage the outer peripheral side of the drive tumbler with the protrusions arranged on the inner surface of the crawler belt, and the crawler belt between the idler It can drive | work by making it go around. At this time, the lower roller guides the crawler belt to press against the ground from above while rolling on the inner surface of the crawler belt. Further, the upper slider is guided so as to support the crawler belt from the lower side while being in sliding contact with the inner surface of the crawler belt.

  Here, the lower traveling body according to Patent Document 1 described above uses a slider that supports the crawler belt in a sliding contact state on the upper side of the side frame without using a roller that may cause rotation failure due to sedimentation or the like. Yes. Further, since the slider is in frictional sliding contact with the inner surface of the crawler belt, wear occurs on the contact surface between the crawler belt and the slider. Furthermore, the inner side surface of the crawler belt is in contact with the drive tumbler, slider, etc., but each contact surface is generally arranged at the center position in the width direction of the crawler belt from the surface of balance or the like.

  Thus, since the drive tumbler, the slider, and the like are in contact with each other at the center position in the width direction of the crawler belt, wear due to frictional contact concentrates on this center position. When the center position of the crawler belt is worn, there is a problem in that the engagement between the crawler belt (protrusion) and the drive tumbler is shifted, so that the life of the crawler belt and the drive tumbler is shortened.

  The present invention has been made in view of the above-described problems of the prior art. The object of the present invention is to disperse the contact position of the drive tumbler and the contact position of the guide member on the track, so that a part of the track is concentrated. It is an object of the present invention to provide a tracked vehicle traveling body that can prevent wear and improve durability, reliability, and the like.

A tracked vehicle traveling body according to the present invention includes a track frame having a center frame and side frames extending in the front and rear directions on the left and right sides of the center frame, and the length of each side frame of the track frame. A drive tumbler having a plurality of meshing parts or connecting parts provided on one side in the direction and spaced apart in the circumferential direction, an idler provided on the other side in the length direction of each side frame, and the meshing part Or a crawler belt that is formed by connecting a plurality of track shoes having engaging protrusions that engage with the connecting portion by using a connecting pin, and is wound between the drive tumbler and the idler, and each side. the upper consisting of the slider or the upper roller guides and supports the track from the lower side between the drive tumbler and the idler provided on the upper surface side of the frame An inner member, comprising a lower roller the guiding the crawler belt from the upper side between the drive tumbler and the idler provided on the lower surface side of the side frames.

Then, in order to solve the above problems, characteristic of the structure of the invention of claim 1 is employed, the inner peripheral side of the track the track shoe, the said engaging projections apart, come in contact with the drive tumbler a tumbler contact surface, pre SL and a slider or roller contact surface come in contact with the slider or the upper roller constituting the upper guide member, the slider or roller in contact with the tumbler contact surface provided on the track shoe The surface is arranged at different positions in the width direction of the track shoe , and the lower roller is provided at a position in contact with the tumbler contact surface provided on the track shoe .

In the invention of claim 2, the track shoe of the crawler belt and the drive tumbler are in contact with each other at a center position in the width direction of the crawler belt , and the track shoe of the crawler belt and the upper guide member are at both side positions in the width direction of the crawler belt, or The configuration is such that the contact is made at one side position.

According to the present invention, when the crawler belt is operated circulation, and tumbler contact surface come in contact with separate drive tumbler engaging projections on the inner circumference side of the track shoe fulfillment band, among the track the track shoe a separate slider or roller contact surface come in contact with the slider or the upper roller constituting the upper guide member and the engaging projection in the circumferential side, are set at different positions in the width direction of the track shoe. Therefore, even if the slider or roller contact surface of the track shoe of the crawler track is worn by the slider or upper roller constituting the upper guide member , the position where this wear occurs is different from the position where the wear occurs due to contact with the drive tumbler. Can be made.

As a result, wear generated on the track shoe of the crawler track can be dispersed in the width direction of the track shoe of the track, so that it is possible to prevent wear due to frictional contact from being concentrated and to improve the durability of the track shoe of the track. it can. In addition, since it is possible to prevent a meshing failure with the drive tumbler due to wear of the track shoes of the crawler belt , it is possible to extend the life of the track shoes and the drive tumbler of the crawler belt and improve reliability and the like.
In this case, the slider or the upper roller provided on the upper side of the side frame of the track frame can support the crawler belt from the lower side as an upper guide member and guide it in the circumferential direction. In addition, since these sliders or upper rollers are configured to contact the track shoe of the crawler track at different positions from the drive tumbler, it is possible to disperse wear generated in the track shoe of the crawler track and enhance durability. Further, it is possible to prevent a meshing failure between the track shoe of the crawler belt and the drive tumbler.

According to the invention of claim 2, the crawler belt and the drive tumbler can be meshed in a balanced manner by bringing the drive tumbler into contact with the track shoe of the crawler belt at the center position in the width direction of the crawler belt. Further, by making the contact surface between the track shoe of the crawler track and the upper guide member at both side positions in the width direction of the crawler track, the contact area between the track shoe of the crawler track and the upper guide member can be widened per unit area. The surface pressure of the crawler belt can be reduced, and wear of the crawler belt by the upper guide member can be suppressed. On the other hand, by setting the contact surface between the track shoe of the crawler belt and the upper guide member at one side position in the width direction of the crawler belt, the crawler belt can be guided with a simple structure and a small number of parts.

  Hereinafter, as a traveling body of a tracked vehicle according to an embodiment of the present invention, a lower traveling body of a hydraulic excavator will be described as an example and described in detail with reference to the accompanying drawings.

  First, FIG. 1 to FIG. 7 show a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a large hydraulic excavator as a tracked vehicle. The hydraulic excavator 1 is a lower traveling body 11 to be described later, an upper revolving body 3 mounted on the lower traveling body 11 via a revolving wheel 2 so as to be able to swivel, and can be moved up and down to the front side of the upper revolving body 3. And a work device 4 that performs earth excavation work and the like.

  Next, 11 shows a track-type (crawler type) lower traveling body. The track-type lower traveling body 11 is for traveling stably on uneven ground, muddy ground, and the like. The lower traveling body 11 includes a track frame 12, a drive tumbler 15, an idler 17, a crawler belt 18, a lower roller 22, a slider 24 and the like which will be described later.

  Reference numeral 12 denotes a track frame of the lower traveling body 11. As shown in FIGS. 2 and 3, the track frame 12 is provided with a center frame 13 located at the center in the left and right directions and provided on both the left and right sides of the center frame 13 and extending in the front and rear directions. And a side frame 14 described later.

  Here, the center frame 13 is formed as a substantially H-shaped structure having four legs 13A extending in the left and right directions (only the right half is shown in FIG. 3). A turning wheel 2 constituting a turning device is attached to the center of the center frame 13, and the upper turning body 3 is mounted via the turning wheel 2. A side frame 14 described later is attached to the tip of each leg portion 13A of the center frame 13.

  Reference numeral 14 denotes a left and right side frame (only the right side is shown) constituting the track frame 12 together with the center frame 13. As shown in FIG. 3, the side frame 14 is disposed so as to extend in the front and rear directions, and is attached to the tip of each leg portion 13 </ b> A of the center frame 13. Further, as shown in FIGS. 3, 4, and the like, the side frame 14 is formed as a rectangular tube-shaped can manufacturing structure that extends in the front and rear directions by welding, for example, strip-shaped steel plates.

  The side frame 14 includes a vertical inner surface plate 14A located on the inner side in the left and right directions on the center frame 13 side, an outer surface plate 14B facing the inner surface plate 14A in the left and right directions, and an inner surface plate. The upper surface plate 14C is formed by connecting the upper portions of 14A and the outer surface plate 14B, and the inner surface plate 14A and the horizontal lower surface plate 14D fixed to the lower end portions of the outer surface plate 14B.

  In addition, a drive tumbler 15 and an idler 17 described later are provided on one side and the other side of the side frame 14 in the length direction. Further, a lower roller 22 described later is attached to the lower surface plate 14D of the side frame 14, and a slider 24 described later is attached to the upper surface plate 14C via a pedestal 23.

  Reference numeral 15 denotes a drive tumbler provided on one side in the length direction of each side frame 14. The drive tumbler 15 is attached to the side frame 14 via a hydraulic motor 16 and drives the crawler belt 18 to rotate using the hydraulic motor 16 as power. 5 and 6, the drive tumbler 15 has a short inner cylinder 15A and an outer cylinder 15B, and the inner peripheral side of the inner cylinder 15A is an output shaft (not shown) of the hydraulic motor 16. Is a spline hole 15C into which is inserted.

  In addition, a large number of meshing portions 15D are arranged at equal intervals in the circumferential direction so as to protrude in the axial direction at both end edges of the outer cylinder 15B. These meshing portions 15D mesh with engagement protrusions 19B of track shoes 19 constituting a crawler belt 18, which will be described later, and projecting intervals are set corresponding to the interval dimensions connecting the track shoes 19. ing.

  Further, the outer cylinder 15 </ b> B of the drive tumbler 15 has a contact surface 15 </ b> E with which the outer peripheral side contacts the crawler belt 18. The contact surface 15E is in contact with each track shoe 19 of the crawler belt 18 wound around the drive tumbler 15, and contacts with a tumbler contact surface 19C described later provided at an intermediate position in the width direction of each track shoe 19. is there.

  On the other hand, 17 is a disk-shaped idler provided on the other side in the length direction of each side frame 14. The idler 17 adjusts the tension of the crawler belt 18 by a crawler belt tension adjusting mechanism (not shown), and is biased toward the other side in the length direction of the side frame 14.

  Reference numeral 18 denotes a crawler belt wound around the drive tumbler 15 and the idler 17. As shown in FIGS. 2 and 7, the crawler belt 18 is configured as an endless track by connecting a large number of track shoes 19 using connecting pins 20. Here, the track shoe 19 constituting the crawler belt 18 is rotatably connected to the adjacent track shoe 19 by inserting a connecting pin 20 into each pin hole 19A extending in the width direction of the crawler belt 18. Reference numeral 21 denotes a retaining bolt for retaining the inserted coupling pin 20.

  Further, the track shoe 19 is provided with two engaging projections 19B projecting at a predetermined interval in the width direction on the inner circumferential surface of the crawler belt 18 connected in an annular shape. It meshes with and engages with each meshing portion 15D of the tumbler 15. Thereby, the drive tumbler 15 can reliably transmit the rotational force to the crawler belt 18 without causing slippage.

  Further, the center position in the width direction of each track shoe 19 constituting the crawler belt 18 (between the engaging protrusions 19B) is a tumbler contact surface 19C. The tumbler contact surface 19C comes into contact with the contact surface 15E of the drive tumbler 15. On the other hand, both side positions in the width direction of each track shoe 19 (outside positions of the engaging protrusions 19B) are slider contact surfaces 19D. The slider contact surface 19D is in contact with a contact surface 24A of the slider 24 described later.

  Here, a tumbler contact surface 19C where each track shoe 19 and the drive tumbler 15 contact each other and a slider contact surface 19D where each track shoe 19 and a later-described slider 24 contact each other are located at the center of the crawler belt 18 in the width direction. Are arranged on both sides and are in different positions. Therefore, even if the slider contact surface 19D of each track shoe 19 is worn by the slider 24, the slider contact surface 19D is different in position from the tumbler contact surface 19C where wear is caused by contact with the drive tumbler 15. In addition, it is possible to disperse wear generated in each track shoe 19 (crawler belt 18) in the width direction, and to prevent early wear due to concentration of wear on a part.

A plurality of lower rollers 22 are provided on the lower surface plate 14D of the side frame 14, and each lower roller 22 is disposed at a predetermined interval in the front and rear directions as shown in FIG. As shown in FIG. 4, the lower roller 22 includes a pair of roller main bodies 22A that contact the tumbler contact surface 19C of each track shoe 19 and a pair of the roller main bodies 22A that are rotatably attached to the lower surface plate 14D of the side frame 14, for example. Bracket 22B. Each lower roller 22 is positioned between the drive tumbler 15 and the idler 17 and rolls on the inner surface of the crawler belt 18 and guides the crawler belt 18 in the circumferential direction so as to press it against the ground from above. Is.

  Reference numeral 23 denotes a plurality of pedestals provided on the upper surface plate 14C of the side frame 14. Each of the pedestals 23 is provided at, for example, three locations near the idler 17, near the drive tumbler 15, and between the leg portions 13A of the center frame 13. Is provided.

Reference numeral 24 denotes a plurality of sliders as upper guide members provided on the upper surface plate 14C of the side frame 14 via the pedestals 23. Each of the sliders 24 includes, for example, three pedestals 23 as shown in FIG. A total of six are provided, two apart from each other in the width direction. Each slider 24 is fixed on the pedestal 23 in a state of being separated from the drive tumbler 15 to the outside in the left and right directions (width direction of the crawler belt 18). Thereby, each slider 24 can contact each slider contact surface 19D of the track shoe 19 constituting the crawler belt 18 at a position different from the tumbler contact surface 19C, as indicated by a two-dot chain line in FIG. it can. Further, the upper surface of each slider 24 is a contact surface 24A that slidably contacts the slider contact surface 19D of the track shoe 19. Thereby, each slider 24 can support the crawler belt 18 from the lower side between the drive tumbler 15 and the idler 17 and can guide it in the circumferential direction.

  The hydraulic excavator 1 according to the first embodiment has the above-described configuration. Next, an operation when the hydraulic excavator 1 travels with the lower traveling body 11 of the hydraulic excavator 1 will be described.

  First, when the lower traveling body 11 is caused to travel, pressure oil is supplied to the hydraulic motor 16 to rotationally drive the drive tumbler 15. At this time, by engaging the engaging portion 15D of the drive tumbler 15 with the engaging protrusion 19B of each track shoe 19, the crawler belt 18 can be rotated around the idler 17 by the drive tumbler 15. The lower traveling body 11 can be caused to travel by the revolving operation of the crawler belt 18.

  Further, when the crawler belt 18 is rotated, the lower rollers 22 and the sliders 24 guide the crawler belt 18 in the rotating direction. In addition, when the crawler belt 18 is rotated, the contact surface 15E of the drive tumbler 15 contacts the tumbler contact surface 19C of each track shoe 19 constituting the crawler belt 18. Further, the contact surface 24 </ b> A of each slider 24 contacts the slider contact surface 19 </ b> D of each track shoe 19. In this case, since the tumbler contact surface 19C and the slider contact surface 19D of each track shoe 19 are at different positions, the portion where the track shoe 19 is worn by frictional contact can be made different, and only the tumbler contact surface 19C. Can be prevented from being concentrated and worn.

  Thus, according to the first embodiment, the tumbler contact surface 19C where each track shoe 19 (crawler belt 18) and the drive tumbler 15 contact each other, and the slider contact surface 19D where each track shoe 19 and each slider 24 contact each other. Are in different positions in the width direction of the crawler belt 18. Therefore, even if each track shoe 19 is worn by the slider 24, the slider contact surface 19 </ b> D where this wear occurs can be made different in position from the tumbler contact surface 19 </ b> C where wear occurs due to contact with the drive tumbler 15.

  As a result, wear generated in each track shoe 19 (crawler belt 18) can be distributed to both sides of the crawler belt 18 in the width direction, so that early wear can be prevented and the durability of the crawler belt 18 can be enhanced. Further, since it is possible to prevent the engagement failure with the drive tumbler 15 due to the early wear of the crawler belt 18, the engagement between the crawler belt 18 and the drive tumbler 15 can be kept normal for a long period of time. Can be improved.

  The crawler belt 18 and the drive tumbler 15 are in contact with each other at the center position in the width direction of the crawler belt 18, and the crawler belt 18 and the slider 24 are in contact with each other at both positions in the width direction of the crawler belt 18. Thereby, the crawler belt 18 can mesh with the drive tumbler in contact with the center position in the width direction with good balance, and the crawler belt 18 can smoothly move around.

  Further, since the crawler belt 18 has slider contact surfaces 19D with the sliders 24 at the positions on both sides in the width direction of the crawler belt 18, the contact area between the crawler belt 18 and the sliders 24 is widened per unit area. The surface pressure of the crawler belt 18 and each slider 24 can be suppressed.

  Next, FIGS. 8 to 11 show a second embodiment of the present invention. A feature of the present embodiment is that a single projection is provided on the track shoe and a drive tumbler is engaged with the projection. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 8, 31 is a side frame according to the second embodiment. The side frame 31 is formed as a rectangular tube-shaped can-making structure extending in the front and rear directions in substantially the same manner as the side frame 14 described above. The side frame 31 includes an inner surface plate 31A, an outer surface plate 31B, an upper surface plate 31C, a lower surface plate 31D, and the like.

  Reference numeral 32 denotes a drive tumbler according to the second embodiment provided on one side in the length direction of the side frame 31 (see FIG. 9). The drive tumbler 32 is attached to the side frame 31 via the hydraulic motor 16. Further, as shown in FIGS. 9 and 10, the drive tumbler 32 includes a short cylindrical body 32A, two circular plates 32B provided on the outer peripheral side of the cylindrical body 32A at intervals in the axial direction, and each of the circles. A plurality of connecting portions 32C are arranged on the outer peripheral side between the plates 32B with a predetermined interval in the circumferential direction, and the respective discs 32B are connected in a ladder shape. The inner peripheral side of the cylindrical body 32A is formed with a spline hole 32D. It has become.

  Here, the drive tumbler 32 is configured such that each connecting portion 32C meshes with an engaging protrusion 34B of each track shoe 34 constituting a crawler belt 33 described later. Further, the drive tumbler 32 has a contact surface 32 </ b> E in which the outer peripheral side of each disk 32 </ b> B contacts the crawler belt 33. The contact surface 32E is in contact with each track shoe 34 of the crawler belt 33 wound around the drive tumbler 32, and comes into contact with a tumbler contact surface 34C described later provided at an intermediate position in the width direction of each track shoe 34. is there.

  Reference numeral 33 denotes a crawler belt according to the second embodiment. As shown in FIG. 11, the crawler belt 33 is composed of a number of track shoes 34 using connecting pins 35 in substantially the same manner as the crawler belt 18 according to the first embodiment. By connecting, it is configured as an endless track. Here, each track shoe 34 is rotatably connected to an adjacent track shoe 34 by inserting a connection pin 35 into each pin hole 34A and attaching a retaining bolt 36. Each track shoe 34 is provided with one engaging protrusion 34B at the center in the width direction, and the engaging protrusion 34B is engaged with and engaged with each connecting portion 32C of the drive tumbler 32. It is.

  Further, the center position in the width direction of each track shoe 34 (around the engaging protrusion 34B) is a tumbler contact surface 34C. The tumbler contact surface 34C comes into contact with the contact surface 32E of the drive tumbler 32. On the other hand, both side positions in the width direction of each track shoe 34 are slider contact surfaces 34D. The slider contact surface 34D is in contact with a contact surface 39A of a slider 39 described later.

  Here, a tumbler contact surface 34C where each track shoe 34 and the drive tumbler 32 contact each other, and a slider contact surface 34D where each track shoe 34 and a slider 39 described later contact each other, are the center position in the width direction of the crawler belt 33. They are arranged on both sides and are in different positions. Accordingly, in substantially the same manner as in the first embodiment, the wear generated in each track shoe 34 can be dispersed in the width direction, and early wear due to the concentration of wear on a part can be prevented.

37 is a second lower roller that by the embodiments provided plurality in the lower plate 31D of the side frame 31 (shown only one in Fig. 8). The lower roller 37 includes, for example, a roller main body 37A that contacts the tumbler contact surface 34C of each track shoe 34, and a pair of brackets 37B that rotatably attach the roller main body 37A to the lower surface plate 31D of the side frame 31. Yes. Here, the lower roller 37 according to the second embodiment has a concave groove 37A1 in an intermediate portion in the axial direction in order to avoid the engaging protrusion 34B of each track shoe 34.

  Reference numeral 38 denotes a plurality of pedestals (only one is shown) provided on the upper surface plate 31C of the side frame 31. Each pedestal 38 is substantially the same as the pedestal 23 according to the first embodiment. It is provided at three locations near the drive tumbler 32 and between the leg portions 13A of the center frame 13.

Reference numeral 39 denotes a plurality of sliders as upper guide members provided on the upper surface plate 31C of the side frame 31 via the pedestals 38. The sliders 39 are spaced apart from each other in the width direction on the pedestals 38. Each is provided (only two are shown). Further, the sliders 39 are arranged in a state of being separated from the drive tumbler 32 to the outside in the left and right directions (width direction of the crawler belt 33). As a result, as shown by a two-dot chain line in FIG. 9, each slider 39 has a contact surface 39 </ b> A on each slider contact surface 34 </ b> D of the track shoe 34 constituting the crawler belt 33 at a position different from the tumbler contact surface 34 </ b> C. Can touch.

  Thus, also in the second embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. In particular, in the second embodiment, the crawler belt 33 provided with one engagement protrusion 34B on the track shoe 34 also has a tumbler contact surface 34C with the drive tumbler 32 and a slider contact surface 34D with the slider 39. And can be arranged separately.

Next, FIG. 12 shows a third embodiment of the present invention. The feature of this embodiment is that a roller for supporting the crawler belt from below is used as the upper guide member provided on the upper surface side of the side frame of the track frame. Note that in the third embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 12, reference numeral 41 denotes a crawler belt according to the third embodiment, and reference numeral 42 denotes a plurality of track shoes constituting the crawler belt 41. Further, each track shoe 42 has two engagement protrusions 42A in substantially the same manner as the track shoe 19 according to the first embodiment, and the drive tumbler 15 contacts the center position between the engagement protrusions 42A. This is a tumbler contact surface 42B. However, each track shoe 42 is different from the track shoe 19 according to the first embodiment in that both side positions in the width direction are roller contact surfaces 42C with which an upper roller 44 described later contacts.

  The tumbler contact surface 42B where each track shoe 42 and the drive tumbler 15 contact each other and the roller contact surface 42C where each track shoe 42 and the upper roller 44 contact each other are located at the center position and both side positions of the crawler belt 41 in the width direction. Arranged in different positions.

  Reference numeral 43 denotes a plurality of pedestals (only one is shown) provided on the upper surface plate 14C of the side frame 14. The pedestals 43 are, for example, in the vicinity of the idler 17, in the vicinity of the drive tumbler 15, and in the legs of the center frame 13. It is provided in three places between 13A.

Reference numeral 44 denotes a plurality of upper rollers as upper guide members provided on the upper surface plate 14C of the side frame 14 via the pedestals 43. The upper rollers 44 are spaced apart on the pedestals 43 in the width direction. Two are provided (only two are shown). Further, each upper roller 44 is arranged in a state of being separated from the drive tumbler 15 to the outside in the left and right directions (width direction of the crawler belt 18). Thereby, each upper roller 44 can contact each roller contact surface 42C of the track shoe 42 with the peripheral surface of the roller body 44A as a contact surface at a position different from the tumbler contact surface 42B.

  Thus, also in the third embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. In particular, in the third embodiment, the crawler belt 41 can be smoothly guided by the rotatable upper roller 44.

In the first embodiment, a total of six sliders 24 as upper guide members are arranged on the upper surface plate 14 </ b> C of the side frame 14 by arranging two sliders 24 at three positions in the length direction of the side frame 14. The case where it is provided has been described as an example. However, the present invention is not limited to this. For example, as in the first modification shown in FIG. 13, the sliders 51 are arranged on the top plate 14C of the side frame 14 in a staggered manner (alternating left and right in the front and rear directions). It is good also as a structure to install. This configuration can be similarly applied to other embodiments.

Further, in the first embodiment, the slider 24 as the upper guide member is separated from the upper surface plate 14C of the side frame 14 in the left and right directions so as to come into contact with both side positions of the crawler belt 18 in the width direction. The case where it arrange | positions was illustrated. However, the present invention is not limited to this, and as in the second modification shown in FIG. 14, the slider 61 is attached to the side frame 14 so as to contact one side position in the width direction of the crawler belt 18, for example, the outer position. It is good also as a structure arrange | positioned only on the outer side of the upper surface board 14C. Moreover, it is good also as a structure which arrange | positions a slider so that the inner position of the width direction of the crawler belt 18 may be contacted. These configurations can be similarly applied to other embodiments.

  Moreover, in each embodiment, the lower traveling body 11 of the hydraulic excavator 1 is illustrated as a traveling body of a tracked vehicle. However, the present invention is not limited to this, and can be widely applied to traveling bodies of other tracked vehicles such as a hydraulic crane and a bulldozer.

It is a front view which shows the hydraulic excavator provided with the lower traveling body by the 1st Embodiment of this invention. It is a front view which expands and shows the lower traveling body in FIG. It is a top view which shows the right half of a lower traveling body in the state which omitted the crawler belt. FIG. 4 is an enlarged sectional view of a side frame, a crawler belt, a lower roller, and a slider as seen from the direction of arrows IV-IV in FIG. 2. FIG. 5 is an enlarged cross-sectional view of the drive tumbler, crawler belt, and the like when viewed from the direction of arrows V-V in FIG. 2. It is an external appearance perspective view which expands and shows a single drive tumbler. It is an external appearance perspective view which decomposes | disassembles and shows a part of track shoe which comprises a crawler belt. It is the expanded sectional view which looked at the side frame, crawler belt, lower roller, and slider by the 2nd Embodiment of this invention from the same position as FIG. It is the expanded sectional view which looked at the drive tumbler, crawler belt, etc. by a 2nd embodiment from the same position as Drawing 5. It is an external appearance perspective view which expands and shows a single drive tumbler. It is an external appearance perspective view which decomposes | disassembles and shows a part of track shoe which comprises a crawler belt. It is the expanded sectional view which looked at the upper roller by the 3rd Embodiment of this invention from the same position as FIG. FIG. 5 is a plan view of a lower traveling body, in which the arrangement of sliders according to a first modification of the present invention is viewed from the same position as in FIG. It is the top view of the lower traveling body which looked at the arrangement of the slider by the 2nd modification of the present invention from the same position as Drawing 3.

Explanation of symbols

1 Excavator 11 Lower traveling body (traveling body)
12 track frame 13 center frame 14, 31 side frame 15, 32 drive tumbler 15E, 32E contact surface 17 idler 18, 33, 41 crawler track 19, 34, 42 track shoe 19A, 34A pin hole 19B, 34B, 42A engagement protrusion 19C , 34C, 42B tumbler contacting surface 19D, 34D slider contact surfaces 22 and 37 under low La
24, 39, 51, 61 Slider ( upper guide member)
42C Roller contact surface 44 Upper roller ( upper guide member)

Claims (2)

A track frame having a center frame and side frames extending in the front and rear directions on both the left and right sides of the center frame, and provided on one side in the length direction of each side frame of the track frame and spaced apart in the circumferential direction A drive tumbler having a plurality of meshing parts or connecting parts, an idler provided on the other side in the length direction of each side frame, and an engaging protrusion engaging with the meshing parts or the connecting parts. A crawler belt formed by connecting a plurality of track shoes using a connecting pin and wound between the drive tumbler and the idler, and the drive tumbler and idler provided on the upper surface side of each side frame. an upper guide member consisting of a slider or the upper roller guides and supports the track from the lower side between said each side frame In the running of the crawler type vehicle comprising a lower roller for guiding the crawler belt from the upper side between the drive tumbler and the idler provided on the surface side,
The inner peripheral side of the track the track shoe is the engaging projection apart from, come in contact with the tumbler contact surface come in contact with the drive tumbler, the slider or the upper roller constituting the front Stories upper guide member slider Or a roller contact surface ,
The tumbler contact surface provided on the track shoe and the slider or roller contact surface are arranged at different positions in the width direction of the track shoe ,
The lower roller is provided at a position where it comes into contact with the tumbler contact surface provided on the track shoe . The track shoe of the crawler belt and the drive tumbler are in contact with each other at a center position in the width direction of the crawler belt , and the track shoe of the crawler belt and the upper guide member are in contact with each other at both sides in the width direction of the crawler belt or at one side position. The traveling body of a tracked vehicle according to claim 1.

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