Traveling device for construction machine

Abstract

To suppress abrasion of a driving wheel and a track link of a crawler by simple work, and to improve operation efficiency.SOLUTION: Between the driving wheel 12 and the plurality of pairs of track links 15 of the crawler belt 14, a wear suppressing member 20 for suppressing wear of the driving wheel 12 and the track links 15 is provided in a replaceable manner. Thus, the wear inhibiting member 20 can inhibit wear of the drive wheel 12 and the track link 15, and can be replaced with a new wear inhibiting member 20 while the crawler belt 14 is wound around the drive wheel 12.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a traveling device of a construction machine provided on a lower traveling body of a hydraulic excavator or the like. [Background technology]

[0002] Crawler-type construction machines such as hydraulic excavators and bulldozers have a track frame on the underside of the vehicle body, and side frames located on both the left and right sides of the track frame each have a traveling device.

[0003] The left and right traveling devices each include a drive wheel provided at a first end of a side frame extending in the traveling direction, an idler wheel provided at a second end of the side frame, and a track wound between the drive wheel and the idler wheel. The drive wheel is formed as a sprocket having a plurality of teeth on its outer periphery. The track also includes multiple pairs of track links connected in the traveling direction so as to sandwich the teeth of the drive wheel laterally, and multiple shoes attached to the outer periphery of the multiple pairs of track links.

[0004] The drive wheels and the track links of the crawler belt wear due to frictional contact. If this wear progresses, the drive wheels or track links must be replaced. The replacement work requires a lot of effort, and the construction machine cannot be operated during the replacement work, resulting in a decrease in operating efficiency. In particular, large construction machines require a lot of effort and may result in a significant decrease in operating efficiency because each part is large and heavy.

[0005] Therefore, some construction machines are designed so that only the outer periphery of the drive wheel that comes into contact with the track link, i.e., the toothed portion, can be replaced (Patent Document 1). In this configuration, the outer periphery of the drive wheel is divided into multiple parts in the circumferential direction, and each outer periphery portion is attached replaceably using bolts or the like. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2022-113130 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the invention of Patent Document 1 has a structure in which the outer peripheral portion of the drive wheel is detachable, so when replacing the outer peripheral portion of the drive wheel, it is necessary to separate the drive wheel from the track. Also, each of the outer peripheral portions divided into five parts is heavy, so it requires labor to transport them. Therefore, the invention of Patent Document 1 has the problem that replacing the outer peripheral portion of the drive wheel requires a lot of labor and time, and also reduces operating efficiency.

[0008] An object of one embodiment of the present invention is to provide a traveling device for a construction machine that can suppress wear between the drive wheels and the track links of the crawler with a simple operation without separating the drive wheels and the crawler, and that can improve operating efficiency. [Means for solving the problem]

[0009] One embodiment of the present invention relates to a running device for a construction machine comprising a drive wheel provided at a first end of a side frame extending in the running direction, an idler wheel provided at a second end of the side frame, and a track including multiple pairs of track links wound between the drive wheel and the idler wheel and connected in the running direction in pairs so as to sandwich the drive wheel on either side in the left-right direction, in which replaceable wear suppression members are provided between the drive wheel and the multiple pairs of track links to suppress wear on the drive wheel and the track links. [Effects of the Invention]

[0010] According to one embodiment of the present invention, wear between the drive wheels and the track links of the crawler can be reduced with a simple operation without separating the drive wheels and the crawler, and the operating efficiency of the construction machine can be improved. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a left side view of a hydraulic excavator equipped with a traveling device according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a left side view showing a lower traveling body equipped with a traveling device. [Figure 3] 3 is a left side view showing the drive wheel, crawler belt, and wear-suppressing member in FIG. 2. FIG. [Figure 4] 4 is a cross-sectional view of the crawler belt as seen from the direction of arrows IV-IV in FIG. 3. [Figure 5] FIG. [Figure 6] 8 is a cross-sectional view showing the drive wheels, crawler tracks, and wear-suppressing members taken from the direction of arrows VI-VI in FIG. 7. [Figure 7] 7 is a cross-sectional view showing the drive wheels, crawler tracks, and wear-suppressing members taken from the direction of arrows VII-VII in FIG. 6. [Figure 8] FIG. 1 is a perspective view showing a wear-suppressing member according to a first embodiment. [Figure 9] FIG. 10 is a left side view showing a drive wheel, a crawler track, and a wear-suppressing member according to a second embodiment. [Figure 10] 12 is a cross-sectional view showing the drive wheels, crawler tracks, and wear-suppressing members according to the second embodiment, taken in the direction of arrow XX in FIG. [Figure 11] 11 is a cross-sectional view showing the drive wheels, crawler tracks, and wear-suppressing members taken from the direction of arrows XI-XI in FIG. [Figure 12] FIG. 10 is a perspective view showing a wear-suppressing member according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, a traveling device for a hydraulic excavator will be described in detail as an example of a traveling device for a construction machine according to an embodiment of the present invention, with reference to the accompanying drawings. In this embodiment, the traveling direction of the hydraulic excavator will be referred to as the front-rear direction, and the lateral direction perpendicular to the traveling direction of the hydraulic excavator will be referred to as the left-right direction.

[0013] 1 to 8 show a first embodiment of the present invention. The first embodiment is characterized in that a wear-suppressing member is attached to the side of a drive wheel that faces the track link in the left-right direction.

[0014] 1, a hydraulic excavator 1 serving as a construction machine includes a self-propelled crawler-type lower traveling body 2, an upper rotating body 3 rotatably mounted on the lower traveling body 2, and a working device 4 rotatably provided in front of the upper rotating body 3. The hydraulic excavator 1 performs work such as excavating earth and sand by rotating the upper rotating body 3 and the working device 4.

[0015] As shown in Fig. 2, the lower traveling body 2 has a track frame 5 that serves as a base. The track frame 5 includes a center frame 5A on which the upper rotating body 3 is rotatably mounted, and left and right side frames 5B (only the left side is shown) that are provided on both the left and right sides of the center frame 5A, sandwiching the center frame 5A. The side frames 5B are formed as metal structures that extend in the front-to-rear direction, which is the traveling direction.

[0016] A bracket 5C is provided at the rear of the side frame 5B, and a travel motor (not shown) that drives the drive wheels 12 is attached to this bracket 5C. A travel device 11, which will be described later, is provided on each of the left and right side frames 5B.

[0017] Next, the configuration and operation of the traveling device 11 of the hydraulic excavator 1 according to the first embodiment will be described in detail.

[0018] The traveling device 11 is configured as a crawler-type traveling device that allows the hydraulic excavator 1 to travel. The traveling device 11 includes drive wheels 12, idler wheels 13, crawler belts 14, and wear-suppressing members 20, which will be described later.

[0019] The drive wheel 12 is provided at the rear end, which is the first end in the longitudinal direction of the side frame 5B. Specifically, the drive wheel 12 is attached to a bracket 5C provided at the rear end of the side frame 5B via a traction motor. The drive wheel 12 is formed as a circular sprocket.

[0020] As shown in Figures 3 and 6, a plurality of teeth 12A are provided consecutively at regular intervals in the rotational direction (circumferential direction) on the outer periphery of the drive wheel 12. The plurality of teeth 12A are formed in a triangular (mountain-shaped) shape that protrudes outward in the radial direction. In this case, the triangular (mountain-shaped) teeth 12A have oblique ridge lines 12B that extend in a V-shape from the apexes so as to move away from each other. When the drive wheel 12 rotates, the apex side portions of the ridge lines 12B engage (abut) with bushes 16 of the crawler belt 14, which will be described later.

[0021] Further, a step 12C is formed on the drive wheel 12, positioned radially inward of the plurality of tooth portions 12A. Specifically, the step 12C is disposed radially inward by a predetermined distance from a tooth bottom 12D (a minimum diameter portion) between adjacent tooth portions 12A. Meanwhile, as shown in Fig. 7, the outer diameter side of the step 12C is a side surface 12E to which a wear-reducing member 20, described below, is attached.

[0022] Furthermore, a plurality of threaded holes 12F are provided in the drive wheel 12, extending in the thickness direction, at positions near the inner diameter side of the stepped portion 12C. The plurality of threaded holes 12F are arranged, for example, two per group, at intervals in the circumferential direction of the drive wheel 12, on the inner diameter side of the plurality of tooth portions 12A. Bolts 21 (described below) that secure the wear-reducing member 20 are screwed into the plurality of threaded holes 12F.

[0023] Therefore, the portion radially inward of the step 12C is thinner than the portion of the side surface 12E located radially outward of the step 12C, making it possible to reduce the weight of the drive wheel 12 at the thinner portion radially inward of the step 12C, and also to stably hold the wear suppression member 20 (described later) by hooking it onto the step 12C.

[0024] When the drive wheels 12 are rotated by a travel motor (electric motor, hydraulic motor, or the like), the ridges 12B of the teeth 12A are engaged with bushes 16 of the crawler belts 14 (described later) and pushed in the circumferential direction. As a result, the drive wheels 12 cause the crawler belts 14 to move in circumferential directions, causing the lower traveling body 2 to travel.

[0025] Idler wheel 13 is provided at the front end, which is the second longitudinal end, of side frame 5B. Idler wheel 13 guides crawler belt 14 to prevent the front portion of crawler belt 14 from shifting left or right as it moves around, and is rotatably attached to side frame 5B.

[0026] The crawler belt 14 is wound around the drive wheel 12 and the idler wheel 13. The crawler belt 14 is driven by the drive wheel 12, and moves in a circular motion between the drive wheel 12 and the idler wheel 13, causing the hydraulic excavator 1 to travel. The crawler belt 14 is configured to include track links 15, bushings 16, connecting pins 17, and shoes 18, which will be described later.

[0027] The track links 15 are paired so as to sandwich the drive wheels 12 in the left-right direction. As shown in Figures 4 and 5, a connecting pin 17 (described later) is inserted between adjacent track links 15 in the running direction, so that multiple pairs of track links 15 are endlessly connected. The pair of track links 15, i.e., the left track link 15 and the right track link 15, are symmetrical in the left-right direction and face each other with a fixed gap in the left-right direction.

[0028] The pair of track links 15 are formed as oval plates whose longitudinal direction coincides with the circumferential direction of the crawler belt 14. A first end of the track link 15 in the longitudinal direction constitutes an outer link portion 15A, and a second end of the track link 15 in the longitudinal direction constitutes an inner link portion 15B.

[0029] The inner width dimension between the outer link portions 15A of a pair of track links 15 is set to a value larger than the outer width dimension between the inner link portions 15B of a pair of track links 15. This allows the inner link portions 15B of an adjacent pair of track links 15 to be sandwiched between the outer link portions 15A of the pair of track links 15. When the outer link portion 15A and the inner link portion 15B are overlapped in the left-right direction, a pin insertion hole 15D and a bush insertion hole 15E, which will be described later, are arranged coaxially. In addition, the inner link portions 15B of the pair of track links 15 are formed with inner side surfaces 15C that face the side surfaces 12E (tooth portions 12A) of the drive wheels 12.

[0030] 4, a pin insertion hole 15D into which a connecting pin 17 is inserted is provided penetrating in the left-right direction in the outer link portion 15A of the pair of track links 15. Meanwhile, a bush insertion hole 15E into which a bush 16 is inserted is formed in the inner link portion 15B of the pair of track links 15.

[0031] The bushing 16 is provided between a pair of track links 15 facing each other in the left-right direction. The bushing 16 is formed as a cylindrical body (tubular body) extending in the left-right direction. Both ends of the bushing 16 are press-fitted into bushing insertion holes 15E of the pair of facing track links 15. As a result, the pair of track links 15 are connected by the bushing 16 at the inner link portions 15B. A connecting pin 17 is rotatably inserted into the inner periphery of the cylindrical bushing 16.

[0032] The connecting pin 17 is formed in a cylindrical shape, and its axial middle portion is inserted through the inner periphery of the bushing 16. Both ends of the connecting pin 17 are inserted and fitted in pin insertion holes 15D formed in the outer link portions 15A of the pair of track links 15 in a press-fit state.

[0033] Therefore, when connecting a pair of adjacent track links 15 using the connecting pin 17, the inner link portions 15B of the pair of adjacent track links 15 are sandwiched between the outer link portions 15A of the pair of track links 15, thereby arranging the pin insertion hole 15D and the bushing insertion hole 15E (bush 16) coaxially. In this state, the connecting pin 17 is inserted into the bushing 16, and both ends of the connecting pin 17 are inserted into the pin insertion hole 15D.

[0034] As a result, the connecting pin 17 can rotatably connect the outer link portions 15A of a pair of track links 15 to the inner link portions 15B of an adjacent pair of track links 15. By continuing the connecting structure using the connecting pins 17, multiple pairs of track links 15 can be connected in an endless manner.

[0035] A plurality of shoes (track shoes) 18 are attached to a pair of track links 15. Each shoe 18 is formed as a metal plate that is long in the left-right direction. As shown in Fig. 5, each shoe 18 is attached to the pair of track links 15 using a shoe bolt 19.

[0036] Next, the configuration and effects of the wear-reducing member 20, which is a characteristic feature of the first embodiment, will be described in detail.

[0037] The wear-inhibiting members 20 are provided between the drive wheels 12 and the plurality of pairs of track links 15 that constitute the crawler belt 14. The wear-inhibiting members 20 inhibit wear on the drive wheels 12 and the plurality of track links 15. In the first embodiment, the wear-inhibiting members 20 are attached to the side surfaces 12E of the drive wheels 12 that face the inner surfaces 15C of the track links 15 in the left-right direction. A plurality of the wear-inhibiting members 20 are provided in the circumferential direction (rotational direction) to correspond to the tooth portions 12A of the drive wheels 12. Note that a configuration in which a plurality of the wear-inhibiting members 20 are provided at intervals of every other tooth portion 12A may also be adopted.

[0038] As shown in Fig. 6, the wear reducing member 20 is formed as a plate with a triangular (V-shaped) tip end and a rectangular base end, resulting in an overall pentagonal shape. As shown in Fig. 7, the wear reducing member 20 has a mounting surface 20A that faces the side surface 12E of the drive wheel 12, and a contact surface 20B that is located on the opposite side of the mounting surface 20A in the plate thickness direction and serves as an opposing surface that faces the inner surface 15C of the track link 15. The contact surface 20B has a gap between it and the inner surface 15C that is large enough to prevent significant rattling, for example, a gap of about 1 to 10 mm.

[0039] Furthermore, two inclined surfaces 20C are provided at the tip end of the wear-suppressing member 20, and are arranged at an acute angle along the ridge line 12B of the tooth portion 12A of the drive wheel 12. As shown in Fig. 8, the two inclined surfaces 20C form end faces between the mounting surface 20A and the contact surface 20B.

[0040] The wear-reducing member 20 has a chamfered portion 20D at the corner between a contact surface 20B, which is the surface facing the track link 15, and a sloped portion 20C, which is the circumferential surface along the ridge line 12B of the tooth portion 12A. The chamfered portion 20D connects the contact surface 20B and the sloped portion 20C with an arcuate surface (a so-called R-chamfer). This prevents the corner (edge) of the wear-reducing member 20 from being damaged or the inner surface 15C from being scraped when the contact surface 20B comes into contact with the inner surface 15C of the track link 15.

[0041] Here, the wear-reducing member 20 is formed using a material with a lower hardness than the track link 15, such as spring steel. The wear-reducing member 20 can also be formed using a metal material other than spring steel, a hard resin material with wear resistance, or the like. The wear-reducing member 20 may be configured so that at least the hardness of the contact surface 20B that comes into contact with the inner surface 15C of the track link 15 is set to a lower hardness than the track link 15. In other words, the wear-reducing member 20 may be configured by combining a plurality of different types of materials, and only the contact portion may have a predetermined hardness.

[0042] As shown in Fig. 7, the wear reducing member 20 has a rectangular base end attached to the drive wheel 12. The base end of the wear reducing member 20 is provided with a protrusion 20E that protrudes toward the drive wheel 12 beyond the attachment surface 20A and engages with the step 12C from the inner diameter side. The base end of the wear reducing member 20 is also provided with two bolt insertion holes 20F at positions that are coaxial with the threaded holes 12F when the two inclined surfaces 20C are aligned with the two ridges 12B of the drive wheel 12 and the protrusions 20E are abutted against the step 12C. The bolt insertion holes 20F are formed as stepped holes to accommodate the heads of bolts 21, which will be described later.

[0043] The wear reducing member 20 configured in this manner is disposed at the position of the tooth portion 12A so that the two inclined portions 20C are aligned with the two ridge lines 12B of the drive wheel 12, and the protruding portion 20E is brought into contact with the stepped portion 12C. In this state, the bolt 21 inserted through the bolt insertion hole 20F is screwed into the threaded hole 12F of the drive wheel 12. This allows the wear reducing member 20 to be detachably (replaceably) attached to the side surface 12E of the drive wheel 12 using the bolt 21 as a screw member.

[0044] When the drive wheels 12 and the crawler tracks 14 move relatively left and right during travel and the drive wheels 12 approach the track links 15, the contact surfaces 20B of the plurality of wear-inhibiting members 20 attached to the drive wheels 12 come into contact with the inner surfaces 15C of the track links 15. At this time, the hardness of the wear-inhibiting members 20 is set to a value lower than the hardness of the track links 15, so that wear of the wear-inhibiting members 20 can be suppressed, thereby suppressing wear of the track links 15. At the same time, wear of the drive wheels 12 covered with the wear-inhibiting members 20 can also be suppressed.

[0045] Next, the procedure for replacing a wear-reducing member 20 that has worn down and reached its service limit will be described. First, the worker loosens and removes the bolts 21 that secure the wear-reducing member 20 to the drive wheel 12. This allows the worn wear-reducing member 20 to be removed from the drive wheel 12.

[0046] In this case, because the wear reducing member 20 is attached to the side surface 12E of the drive wheel 12, it can be removed with the crawler belt 14 wound around the drive wheel 12. After removing the worn wear reducing member 20, a new wear reducing member 20 can be placed in the same position and attached to the drive wheel 12 by tightening the bolts 21. Even in this case, the new wear reducing member 20 can be attached with the crawler belt 14 wound around the drive wheel 12.

[0047] Thus, according to the first embodiment, replaceable wear-inhibiting members 20 are provided between the drive wheels 12 and the multiple pairs of track links 15 of the crawler belt 14 to inhibit wear on the drive wheels 12 and the track links 15. As a result, the wear-inhibiting members 20 can inhibit wear on the drive wheels 12 and the track links 15, and can be replaced with new wear-inhibiting members 20 while the crawler belt 14 remains wound around the drive wheels 12. As a result, the simple task of replacing the wear-inhibiting members 20 can inhibit wear on the drive wheels 12 and the track links 15, and the operating efficiency of the hydraulic excavator 1 can be improved by shortening the time required for the replacement task.

[0048] The wear-reducing members 20 are attached to the side surfaces 12E of the drive wheels 12 that face the track links 15 in the left-right direction. In this case, the wear-reducing members 20 only need to be provided in an area at most twice the number of teeth 12A of the drive wheels 12, which improves the workability and reduces the cost when replacing the wear-reducing members 20.

[0049] The hardness of at least the contact surface 20B of the wear-reducing member 20 with the track link 15 is set to be lower than the hardness of the track link 15. Specifically, the wear-reducing member 20 is formed using a material (such as spring steel) whose hardness is lower than that of the track link 15. As a result, when the wear-reducing member 20 comes into contact with the track link 15, the wear-reducing member 20 is worn, thereby reducing wear between the drive wheel 12 and the track link 15. Furthermore, worn wear-reducing members 20 can be easily replaced with new wear-reducing members 20.

[0050] The drive wheel 12 has a plurality of triangular teeth 12A that are continuous in the circumferential direction and protrude radially, and the wear-suppressing member 20 is formed as a plate whose tip side forms a triangular shape along the teeth 12A of the drive wheel 12. This allows the wear-suppressing member 20 to cover the side surface 12E of the teeth 12A up to the tip of the teeth 12A.

[0051] The wear-reducing member 20 is attached to the side surface 12E of the drive wheel 12 using a bolt 21 as a screw member. Therefore, the wear-reducing member 20 can be replaced by simply rotating the bolt 21 to remove or attach it.

[0052] The wear-reducing member 20 has a chamfered portion 20D at a corner between a contact surface 20B, which serves as the opposing surface on the track link 15 side, and a sloped portion 20C, which serves as a peripheral surface along the ridge line 12B of the tooth portion 12A. As a result, when the contact surface 20B comes into contact with the inner surface 15C of the track link 15, the chamfered portion 20D can prevent the corner (edge) of the wear-reducing member 20 from being damaged or the inner surface 15C from being scraped.

[0053] The drive wheel 12 has a plurality of teeth 12A that protrude radially and continuously in the circumferential direction, and the crawler belt 14 is arranged at intervals in the left-right direction on either side of the drive wheel 12, and is equipped with a plurality of pairs of track links 15 that are arranged endlessly in the traveling direction, bushings 16 formed of cylindrical bodies extending in the left-right direction and that connect first ends of the pair of track links 15 in the longitudinal direction and with which the teeth 12A of the drive wheel 12 are engaged, and connecting pins 17 that are inserted into the bushings 16 and connect second ends of the pair of track links 15 in the longitudinal direction, the pair of track links 15 having adjacent axial ends that protrude from the bushings 16, and a wear-suppressing member 20 is provided on a side surface 12E of the teeth 12A of the drive wheel 12.

[0054] 9 to 12 show a second embodiment of the present invention. The second embodiment is characterized in that the wear-suppressing members are attached to the inner surfaces of multiple pairs of track links that face the drive wheels in the left-right direction. In the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and their description will be omitted.

[0055] The drive wheel 31 according to the second embodiment has a tooth portion 31A, a ridge line 31B, a step portion 31C, a tooth bottom 31D, and a side surface 31E, similar to the drive wheel 12 according to the first embodiment. However, the drive wheel 31 according to the second embodiment differs from the drive wheel 12 according to the first embodiment in that a screw hole is not formed in the drive wheel 31.

[0056] Like the track link 15 of the crawler belt 14 according to the first embodiment, the track link 33 of the crawler belt 32 according to the second embodiment includes an outer link portion 33A, an inner link portion 33B, an inner surface 33C, a pin insertion hole 33D, and a bushing insertion hole 33E. However, the track link 33 according to the second embodiment differs from the track link 15 according to the first embodiment in that a screw hole 33F, which will be described later, is formed therein.

[0057] The threaded holes 33F are formed in the inner surface 33C, located near the bushing insertion holes 33E, and extending in the left-right direction. Two threaded holes 33F are provided for each track link 33, at positions sandwiching the bushing insertion holes 33E in the longitudinal direction of the track link 33. Bolts 35 for fixing the wear-suppressing members 34, which will be described later, are threaded into the threaded holes 33F.

[0058] Next, the configuration and effects of the wear-reducing member 34, which is a characteristic feature of the second embodiment, will be described in detail.

[0059] The wear-inhibiting members 34 according to the second embodiment are provided between the drive wheels 31 and the plurality of pairs of track links 33 that constitute the crawler belt 32. The wear-inhibiting members 34 inhibit wear of the drive wheels 31 and the plurality of track links 33. In the second embodiment, the wear-inhibiting members 34 are attached to the inner side surfaces 33C of the track links 33 that face the side surfaces 31E of the drive wheels 31 in the left-right direction. The wear-inhibiting members 34 are provided on all of the track links 33. Note that the wear-inhibiting members 34 may be provided on every other track link 33.

[0060] As shown in Fig. 10, the wear-suppressing member 34 is formed as a U-shaped (horseshoe-shaped) plate that straddles the bush 16. As shown in Fig. 12, the wear-suppressing member 34 has an arcuate portion 34A that curves along the bush 16 and straight portions 34B that extend from both ends of the arcuate portion 34A. The arcuate portion 34A is formed in a crescent shape that is wide in the radial direction so that the area of ​​the contact portion with the side surface 31E of the drive wheel 31 is large.

[0061] 11, the wear reducing member 34 has a mounting surface 34C that faces the inner side surface 33C of the track link 33, and a contact surface 34D that is located on the opposite side of the mounting surface 34C in the plate thickness direction and serves as an opposing surface that faces the side surface 31E of the drive wheel 31. The contact surface 34D has a gap between it and the side surface 31E that is large enough to prevent significant rattling, for example, a gap of about 1 to 10 mm.

[0062] The outer periphery of the arc portion 34A of the wear-reducing member 34 forms an arc-shaped outer periphery surface 34E. Furthermore, as shown in Fig. 12, an arc-shaped chamfered portion 34F that smoothly connects the contact surface 34D and the outer periphery surface 34E is provided at the corner between the contact surface 34D, which faces the drive wheel 31, and the outer periphery surface 34E. This chamfered portion 34F prevents the corner (edge) of the wear-reducing member 34 from being damaged or the inner periphery surface 33C from being scraped when the contact surface 34D comes into contact with the inner periphery surface 33C of the track link 33.

[0063] The wear-reducing member 34 is formed using a material with a lower hardness than the track link 33, such as spring steel. The wear-reducing member 34 may also be formed using a metal material other than spring steel, a hard resin material with wear resistance, or the like. The wear-reducing member 34 may also be configured so that at least the hardness of the contact surface 34D that comes into contact with the side surface 31E of the drive wheel 31 is set to be lower than the hardness of the drive wheel 31. In other words, the wear-reducing member 34 may be configured by combining a plurality of different types of materials, and only the contact portion may have a predetermined hardness.

[0064] 10 and 11, the wear reducing member 34 has two straight portions 34B attached to the track link 33. Two bolt insertion holes 34G are provided at the tip ends of the two straight portions 34B at positions that are coaxial with the threaded hole 33F when the wear reducing member 34 is positioned so as to straddle the bushing 16. As shown in FIG. 12, the bolt insertion holes 34G are formed as stepped holes so that the heads of the bolts 35, which will be described later, can fit therein.

[0065] The wear prevention member 34 configured in this manner is disposed so that the two straight portions 34B straddle the bushing 16. In this state, the bolt 35 inserted into the bolt insertion hole 34G is screwed into the threaded hole 33F of the track link 33. This allows the wear prevention member 34 to be detachably (replaceably) attached to the inner surface 33C of the track link 33 using the bolt 35 as a screw member.

[0066] When the drive wheels 31 and crawler tracks 32 move relatively left and right during travel and the drive wheels 31 and track links 33 approach each other, the plurality of wear-inhibiting members 34 attached to the plurality of pairs of track links 33 bring the contact surfaces 34D into contact with the side surfaces 31E of the drive wheels 31. At this time, the hardness of the wear-inhibiting members 34 is set to a value lower than the hardness of the drive wheels 31, so that wear of the wear-inhibiting members 34 can be suppressed, thereby suppressing wear of the drive wheels 31. At the same time, wear of the track links 33 covered with the wear-inhibiting members 34 can also be suppressed.

[0067] Here, when the wear-reducing member 34 is attached to the inner surface 33C of the track link 33, a gap 36 is formed between the wear-reducing member 34 and the bushing 16. More specifically, the gap 36 is formed at a fixed distance between the U-shaped inner peripheral surface 34H and the outer peripheral surface of the bushing 16. The gap 36 can accommodate deformation due to wear of the wear-reducing member 34 and deformation of the track link 33 and the like due to various operations, thereby preventing uneven wear and breakage of the wear-reducing member 34 and allowing the wear-reducing member 34 to wear properly, thereby extending its lifespan.

[0068] Next, we will describe the procedure for replacing a wear-reducing member 34 that has worn down and reached its service limit. First, the worker loosens and removes the bolts 35 that secure the wear-reducing member 34 to the inner surface 33C of the track link 33. This allows the worn wear-reducing member 34 to be removed from the track link 33.

[0069] In this case, because the wear-inhibiting member 34 is attached to the inner surface 33C of the track link 33, it can be removed with the crawler belt 32 wound around the drive wheel 31. After removing the worn wear-inhibiting member 34, a new wear-inhibiting member 34 can be placed in the same position and attached to the inner surface 33C of the track link 33 by tightening the bolts 35. Even in this case, the new wear-inhibiting member 34 can be attached with the crawler belt 32 wound around the drive wheel 31.

[0070] Thus, the second embodiment configured as described above can also achieve the same effects as the first embodiment. In particular, in the second embodiment, the wear reducing members 34 are attached to the inner surfaces 33C of the pairs of track links 33 that face the drive wheels 31 in the left-right direction. In this case, the wear reducing members 34 can be replaced at many positions along the entire length of the crawler belt 32, excluding the positions of the drive wheels 31 and the idler wheels 13. This allows multiple people to replace the wear reducing members 34 in a short amount of time.

[0071] The hardness of at least the contact surface 34D of the wear-reducing member 34 with the drive wheel 31 is set to be lower than the hardness of the drive wheel 31. Specifically, the wear-reducing member 34 is formed using a material (such as spring steel) with a lower hardness than the drive wheel 31. As a result, when the wear-reducing member 34 comes into contact with the drive wheel 31, the wear-reducing member 34 is worn, thereby reducing wear between the drive wheel 31 and the track link 33. Furthermore, worn wear-reducing members 34 can be easily replaced with new wear-reducing members 34.

[0072] The pair of track links 33 in the left-right direction are connected by bushings 16 extending in the left-right direction, and the wear-suppressing members 34 are formed as U-shaped plates that straddle the bushings 16. This allows the wear-suppressing members 34 to accurately come into contact with the side surfaces 31E of the teeth 31A engaged with the bushings 16.

[0073] The wear prevention member 34 is attached to the inner surface 33C of the track link 33 using a bolt 35 as a threaded member. Therefore, the wear prevention member 34 can be replaced by the simple task of rotating the bolt 35 to remove or attach it.

[0074] The wear-reducing member 34 has a chamfered portion 34F at a corner between a contact surface 34D, which is the opposing surface on the drive wheel 31 side, and an arc-shaped outer peripheral surface 34E. As a result, when the contact surface 34D comes into contact with the side surface 31E of the drive wheel 31, the chamfered portion 34F can prevent the corner (edge) of the wear-reducing member 34 from being damaged or the side surface 31E from being scraped.

[0075] The wear-reducing member 34 has a gap 36 between its U-shaped inner peripheral surface 34H and the outer peripheral surface of the bushing 16. As a result, the gap 36 can accommodate deformation due to wear of the wear-reducing member 34 and deformation of the track link 33 and other components due to various operations, preventing uneven wear and damage to the wear-reducing member 34 and allowing the wear-reducing member 34 to wear properly, thereby extending its lifespan.

[0076] The drive wheel 31 has a plurality of teeth 31A that protrude radially and continuously in the circumferential direction, the crawler belt 32 is arranged at intervals in the left-right direction at positions on either side of the drive wheel 31, and is equipped with a plurality of pairs of track links 33 that are arranged endlessly in the traveling direction, bushings 16 formed of cylindrical bodies extending in the left-right direction and that connect first ends of the pair of track links 33 in the longitudinal direction and with which the teeth 31A of the drive wheel 31 are engaged, and connecting pins 17 that are inserted into the bushings 16 and connected to second ends of the pair of track links 33 in the longitudinal direction, each of which has adjacent axial ends that protrude from the bushings 16, and wear-suppressing members 34 are provided on inner surfaces 33C of the pairs of track links 33.

[0077] The first embodiment illustrates a case in which the wear-inhibiting members 20 are provided on the side surfaces 12E of the tooth portions 12A of the drive wheels 12, and the second embodiment illustrates a case in which the wear-inhibiting members 34 are provided on the inner surfaces 33C of the pairs of track links 33. However, the present invention is not limited to these configurations, and the wear-inhibiting members may be provided on both the side surfaces of the tooth portions of the drive wheels and the inner surfaces of the pairs of track links.

[0078] In addition, in each embodiment, the traveling device of the construction machine is described by taking the traveling device 11 of the hydraulic excavator 1 as an example. However, the present invention is not limited to this, and may be applied to the traveling devices of a hydraulic crane, a bulldozer, etc., for example. [Explanation of symbols]

[0079] 1. Hydraulic excavator (construction machinery) 5 Track Frame 5B side frame 11 Running gear 12,31 Drive wheels 12A,31A Teeth 12B, 31B ridgeline 12E,31E side 12F screw hole 13 Idler 14,32 Tracks 15,33 Track Link 16 Bush 17 link 20 Wear-suppressing parts 20B Contact surface (opposite surface) 20C Bevel (circumferential surface) 20D, 34F facet section 21,35 ボルト(ねじComponent) 33C Inner Side 34D Contact Surface (Opposing Surface) 34E outer periphery 34H Inner circumferential surface 36 gaps

Claims

1. a drive wheel provided at a first end of the side frame extending in the traveling direction; an idler wheel provided at a second end of the side frame; a crawler belt including a plurality of pairs of track links wound between the drive wheels and the idler wheels and connected in a traveling direction in pairs so as to sandwich the drive wheels in the left and right direction; A traveling device for a construction machine comprising: A traveling device for a construction machine, characterized in that a wear suppressing member that suppresses wear of the drive wheels and the track links is replaceably provided between the drive wheels and the plurality of pairs of track links.

2. The traveling device for a construction machine according to claim 1, A traveling device for a construction machine, wherein the wear-suppressing member is attached to a side of the drive wheel that faces the track link in the left-right direction.

3. The traveling device for a construction machine according to claim 2, A travel device for a construction machine, wherein the wear-reducing member has a hardness set to be lower than the hardness of the track link at least at the surface that comes into contact with the track link.

4. The traveling device for a construction machine according to claim 2, The drive wheel includes a plurality of triangular teeth that are continuously arranged in a circumferential direction and protrude in a radial direction, A travel device for a construction machine, characterized in that the wear-reducing member is formed as a plate body whose tip side is triangular in shape and follows the teeth of the drive wheel.

5. The traveling device for a construction machine according to claim 2, A traveling device for a construction machine, characterized in that the wear-reducing member is attached to the side surface of the drive wheel using a screw member.

6. The traveling device for a construction machine according to claim 4, A traveling device for a construction machine, characterized in that the wear-reducing member has a chamfered portion at a corner between an opposing surface on the track link side and a peripheral surface along a ridge line of the tooth portion.

7. The traveling device for a construction machine according to claim 1, A traveling device for a construction machine, characterized in that the wear-reducing members are attached to inner surfaces of the plurality of pairs of track links that face the drive wheels in the left-right direction.

8. The traveling device for a construction machine according to claim 7, A travel device for a construction machine, wherein the wear-reducing member has a surface that comes into contact with the drive wheel and has a hardness that is set lower than the hardness of the drive wheel.

9. The traveling device for a construction machine according to claim 7, The pair of track links in the left-right direction are connected by bushes extending in the left-right direction, A traveling device for a construction machine, wherein the wear-reducing member is formed as a U-shaped plate that straddles the bush.

10. The traveling device for a construction machine according to claim 7, A traveling device for a construction machine, characterized in that the wear-reducing member is attached to the inner surface of the track link using a screw member.

11. The traveling device for a construction machine according to claim 9, A travel device for a construction machine, characterized in that the wear-reducing member has a chamfered portion at a corner between the opposing surface on the drive wheel side and the arc-shaped outer peripheral surface.

12. The traveling device for a construction machine according to claim 9, A traveling device for a construction machine, wherein the wear-reducing member has a gap between the inner peripheral surface of the U-shape and the outer peripheral surface of the bushing.

13. The traveling device for a construction machine according to claim 1, The drive wheel includes a plurality of teeth that are continuously arranged in a circumferential direction and protrude radially, The crawler belt is the plurality of pairs of track links are arranged at intervals in the left-right direction at positions sandwiching the drive wheels, and are arranged endlessly continuously in the traveling direction; a bushing formed of a cylindrical body extending in the left-right direction, the bushing connecting first ends of the pair of track links in the length direction and engaging with the toothed portion of the drive wheel; a connecting pin having both axial ends protruding from the bushing when inserted into the bushing, the both axial ends being connected to second longitudinal ends of the pair of adjacent track links; Equipped with A traveling device for a construction machine, characterized in that the wear-reducing member is provided on at least one of the side surface of the tooth portion of the drive wheel and the inner surface of each of the pairs of track links.

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