JP4384590B2 - Traveling device and work machine - Google Patents

Description

  The present invention relates to a traveling device having a cylinder that includes a working fluid supply portion on a side portion thereof and adjusts a biasing force of a biasing means, and a work machine including the traveling device.

  Conventionally, for example, a traveling device used in a work machine such as a hydraulic excavator is provided with a sprocket that can be driven to rotate at one end of a long traveling frame, and a wheel support that can be adjusted at the other end of the traveling frame. An idler is pivotally supported on the wheel support, and an endless crawler belt is wound around the traveling frame from the sprocket to the idler.

Further, a spring is integrally connected to the idler, and a substantially cylindrical adjuster cylinder for adjusting the biasing force of the spring is connected to the spring. The adjuster cylinder is provided with a greasing portion on the side for enabling the greasing of the adjuster cylinder (see, for example, Patent Document 1).
JP-A-9-196135 (page 2-3, FIG. 1-3)

  Generally, the greasing portion of the adjuster cylinder faces an inspection window formed in the outer surface of the traveling frame, and is accessible from the outside through the inspection window.

  However, since the adjuster cylinder can rotate in the circumferential direction with respect to the idler and the spring in the above-described traveling device, the position of the greasing portion moves from the inspection window as the adjuster cylinder rotates in the circumferential direction. There is a problem in that there is a possibility that access from the outside to the greasing part may not be easy due to a gradual shift.

  The present invention has been made in view of these points, and an object of the present invention is to provide a traveling device that secures accessibility from the outside to a working fluid supply section of a cylinder and a work machine including the traveling device. is there.

The invention described in claim 1 is a traveling frame that is long in the traveling direction and has an opening on the outer side, a drive wheel that is provided at one end of the traveling frame and is driven to rotate, and other than the traveling frame. A wheel support provided to be adjustable at the end, a driven wheel pivotally supported by the wheel support, and a winding frame wound around the driven wheel and the drive wheel. An endless crawler belt, accommodated in a traveling frame, formed in a cylindrical shape, and prevented from rotating in the circumferential direction with respect to the wheel support, and in accordance with the direction in which the crawler belt is stretched through the wheel support An urging means for urging the driving wheel and a working fluid supply part facing the opening of the traveling frame are provided on the side and movable in the longitudinal direction with respect to the traveling frame and are prevented from rotating in the circumferential direction with respect to the urging means. Cylinder part and one end side of this cylinder part Input is provided with the other end side adjuster piston which is fixed to the running frame, provided on the opposite side of the rolling wheel support relative to the biasing means, the travel device having a cylinder for adjusting the biasing force of the biasing means A cylindrical urging means for urging the driven wheel in the direction in which the crawler belt is stretched through the wheel support that is prevented from rotating by the traveling frame, is prevented from rotating in the circumferential direction with respect to the wheel support . A cylinder portion, which is located on the opposite side of the wheel support relative to the urging means and adjusts the urging force of the urging means, is movable in the longitudinal direction with respect to the traveling frame of the cylinder. By preventing rotation in the circumferential direction by preventing rotation in the circumferential direction, the displacement of the working fluid supply part provided in the side part of the cylinder part with respect to the opening part provided in the outer part of the traveling frame is prevented, External to the working fluid supply To ensure accessibility.

  According to a second aspect of the present invention, in the traveling device according to the first aspect, the biasing means accommodates a biasing body that biases the driven wheel in a direction in which the crawler belt is stretched via the wheel support, and the biasing body. A cylindrical support, an end plate provided at one end of the cylindrical part, and a case having a groove provided in the axial direction at the other open end of the cylindrical part. One end part is slidably inserted into the case, and is provided with a convex part that protrudes from this one end part and can be fitted into the groove part of the case. In the other end portion of the cylindrical portion of the case of the biasing means, a groove portion is provided in the axial direction to which the convex portion protruding from the wheel support is fitted, so that the biasing means is attached to the wheel support. For example, it is possible to prevent rotation, and for example, there is no need to assemble a separate member, and it is possible to prevent an increase in manufacturing cost due to an increase in the number of parts. It made.

According to a third aspect of the present invention, there is provided a traveling frame that is long in the traveling direction and has an opening on the outer side, a driving wheel that is provided at one end of the traveling frame and is driven to rotate, and other than the traveling frame. A wheel support provided to be adjustable at the end, a driven wheel pivotally supported by the wheel support, and a winding frame wound around the driven wheel and the drive wheel. An endless crawler belt, accommodated in a traveling frame, formed in a cylindrical shape, and prevented from rotating in the circumferential direction with respect to the wheel support, and in accordance with the direction in which the crawler belt is stretched through the wheel support An urging means for urging the driving wheel and a working fluid supply part that is accommodated in the traveling frame and faces the opening of the traveling frame are provided on the side, and the urging force of the urging means is adjusted. Against the circumferential direction of the cylinder The urging means urges the driven wheel in the direction in which the crawler belt is stretched via the wheel support, a cylinder portion that houses the urging body, and an end plate portion provided at one end of the cylinder portion And a case having a groove portion provided in the axial direction at the other open end of the cylindrical portion, and the wheel support is slidably inserted into the case at one end and protrudes into the end. This is a traveling device provided with a convex portion that can be fitted into the groove portion of the case, and has a cylindrical shape that urges the driven wheel in the direction in which the crawler belt is stretched through the wheel support that is prevented from rotating by the traveling frame. The rotation of the cylinder is prevented by rotating the urging means in the circumferential direction with respect to the wheel support, and the cylinder for adjusting the urging force of the urging means in the circumferential direction against the urging means. To prevent, provided on the side of the cylinder with respect to the opening provided on the outside of the traveling frame Cylinder of the case of the urging means that prevents the displacement of the dynamic fluid supply section, ensures accessibility from the outside to the working fluid supply section, and is slidably inserted at one end of the wheel support By providing a groove in the axial direction in which the projection protruding from the wheel support is fitted in the other end of the roller, the biasing means can be reliably prevented from rotating with respect to the wheel support. For example, it is not necessary to assemble a separate member or the like, and it is possible to prevent an increase in manufacturing cost due to an increase in the number of parts.

According to a fourth aspect of the present invention, in the traveling device according to the second or third aspect , the urging means has one end fixed to the cylinder and the other end slid onto the wheel support through the end plate of the case. A rod that is movably inserted and regulates the length of the urging body is provided, and one end side of the rod is screwed to the end plate portion of the case, and the other end side is fixed to the cylinder while the other end side is fixed to the cylinder. By screwing one end of the rod slidably inserted into the wheel support through the case to the end plate of the case, the cylinder is securely prevented from rotating against the urging means, and the case and rod are Since it is only necessary to add a screw process, for example, it is not necessary to assemble another member or the like, and an increase in manufacturing cost accompanying an increase in the number of parts can be prevented more reliably.

According to a fifth aspect of the present invention, there is provided the traveling device according to any one of the first to fourth aspects, a swiveling body that is turnable on the traveling device, and a work device that is operably provided on the swiveling body. A work machine equipped with a biasing means for biasing a driven wheel in a direction in which the crawler belt is stretched through the wheel support, which is prevented from rotating in the circumferential direction with respect to the wheel support. The cylinder for adjusting the rotation is prevented from rotating in the circumferential direction with respect to the biasing means, so that the displacement of the working fluid supply unit provided on the side of the cylinder with respect to the opening provided on the outer side of the traveling frame is shifted. Preventability, secure access to the working fluid supply unit from the outside, and improve maintainability.

According to the first aspect of the present invention, the urging means for urging the driven wheel in the direction in which the crawler belt is stretched via the wheel support that is prevented from rotating by the traveling frame rotates in the circumferential direction with respect to the wheel support. A cylinder portion that is movable in the longitudinal direction with respect to the traveling frame of the cylinder that is positioned on the opposite side of the wheel support to the urging means and adjusts the urging force of the urging means is attached to the urging means. Since the rotation of the cylinder portion is prevented by preventing it from rotating in the circumferential direction with respect to the biasing means, the position of the working fluid supply portion provided on the side portion of the cylinder portion with respect to the opening portion provided on the outer side portion of the traveling frame Misalignment can be prevented and access to the working fluid supply unit from the outside can be secured.

  According to the second aspect of the present invention, the biasing means is provided with a groove in the other end of the cylindrical portion of the case of the biasing means, in which the convex portion protruding from the wheel support is fitted in the axial direction. The means can be reliably prevented from rotating with respect to the wheel support, and, for example, no separate member is required to be assembled, thereby preventing an increase in manufacturing cost due to an increase in the number of parts.

According to the third aspect of the present invention, the biasing means for biasing the driven wheel in the direction in which the crawler belt is stretched via the wheel support that is prevented from rotating by the traveling frame rotates in the circumferential direction with respect to the wheel support. Since the cylinder that stops and adjusts the urging force of the urging means is prevented from rotating in the circumferential direction with respect to the urging means, the cylinder is prevented from rotating. The displacement of the working fluid supply part provided on the side of the cylinder with respect to the part can be prevented, the accessibility to the working fluid supply part from the outside can be secured, and the other end part of the cylinder part of the case of the urging means In addition, by providing a groove in the axial direction in which the convex portion protruding from the wheel support is fitted in the axial direction, the urging means can be reliably prevented from rotating with respect to the wheel support, There is no need for attachment, and the manufacturing cost increases as the number of parts increases. It can be prevented.

According to the fourth aspect of the present invention, one end of the rod that is fixed to one end of the cylinder and slidably inserted through the case into the wheel support is screwed into the end plate of the case. As a result, the cylinder can be reliably prevented from rotating with respect to the urging means, and it is only necessary to add a screw process to the case and the rod. An increase in cost can be prevented more reliably.

According to the fifth aspect of the present invention, the urging means for urging the driven wheel in the direction in which the crawler belt is stretched via the wheel support is prevented from rotating in the circumferential direction with respect to the wheel support. The cylinder for adjusting the urging force is prevented from rotating in the circumferential direction with respect to the urging means, so that the working fluid supply unit provided on the side of the cylinder with respect to the opening provided on the outer side of the traveling frame Misalignment can be prevented, access to the working fluid supply unit from the outside can be secured, and maintainability can be improved.

  Hereinafter, the present invention will be described in detail with reference to the embodiment shown in FIGS.

  FIG. 6 shows a hydraulic excavator as a work machine, and a lower traveling device 1 as a traveling device includes a pair of traveling frames (this traveling frame is called “track frame” or the like) 2 on both the left and right sides. On a center frame (not shown) provided between the frames 2, an upper swing body 3 as a swing body is rotatably provided via a swing bearing portion (not shown). A cab 4 for protecting the operator is mounted, and a work device 5 is operably provided at the center of the front part of the upper swing body 3.

  In the lower traveling device 1, sprockets 12 as drive wheels that are rotationally driven by a hydraulic motor and a speed reducer (not shown) are pivotally supported at one end portions of traveling frames 2 that are positioned on the left and right sides of the hydraulic excavator, An idler 14 as a driven wheel is pivotally supported at the other end of each traveling frame 2 via an idler support 13 as a wheel support, and the traveling frame 2 spans the sprocket 12 and the idler 14. A crawler belt (this crawler belt is called a “track” or “crawler”) 15 is mounted so as to be freely circulated.

  The lower side of the crawler belt 15 is movable from the upper side by a plurality of lower rollers 16 (which are referred to as “track rollers”, etc.) 16 arranged in the lower part of each traveling frame 2 and pivotally supported. Further, the upper portion of the crawler belt 15 is supported by a plurality of upper rollers rotatably supported on the upper portion of each traveling frame 2 via a support bracket 17 (these upper rollers are “carrier rollers” or the like). (Referred to as 18) is movably supported from below.

  Hereinafter, for convenience, the idler 14 side will be described as the front side, and the sprocket 12 side will be described as the rear side.

  As shown in FIG. 5 and FIG. 6, an adjustment group 19 as a crawler belt tension adjusting device that adjusts the tension of the crawler belt 15 by urging the idler 14 via the idler support 13 is provided inside each traveling frame 2. Each is housed. Each adjustment group 19 includes a spring group 21 as an urging means whose front end is integrally connected to the idler support 13 and a spring group 21 integrally connected to the rear end of the spring group 21. An adjuster cylinder 22 is provided as a cylinder for adjusting the power, and a side of the front end portion of the adjuster cylinder 22 is supplied as a working fluid supply / discharge portion capable of supplying and discharging grease as a working fluid to the adjuster cylinder 22. A fat draining part 23 is provided.

  Each traveling frame 2 includes a bottom plate 25 and a top plate 26 that are long in the front-rear direction, which is the traveling direction of the excavator, and a pair of side plates 27 and 28 provided between the bottom plate 25 and the top plate 26, and these bottom plates. 25, a reinforcing bracket 29 provided on the top plate 26 and the side plates 27, 28, a frame plate 31 provided in the lateral direction that is the width direction of the hydraulic excavator in the vicinity of the idler 14, and a hydraulic excavator in the vicinity of the sprocket 12 Frame plates 32 provided in the left-right direction, which is the width direction, are provided.

  The bottom plate 25 is a lower roller 16 pivotally supported on a roller racket (not shown), and is attached to the lower part, and a plurality of holes 35 into which upper ends of the lower rollers 16 are fitted, The holes are spaced apart from each other in the longitudinal direction. In addition, at the position on the bottom side of the bottom plate 25, a sliding plate 36 that is long in the front-rear direction for supporting the lower portion of the spring group 21 is supported by a plurality of brackets 37, respectively.

  Further, the top plate 26 is provided in parallel with the bottom plate 25, and a support bracket 17 is provided on the upper portion thereof. Also, a sediment fall hole 43 for dropping earth and sand adhering to the upper roller 18 to the lower portion of the support bracket 17 is provided. Are respectively drilled.

  Here, the support bracket 17 is provided with a shaft support hole 45 inserted in a shaft (not shown) protruding from the upper roller 18 so as to be pivotally supported, and is drilled in the width direction of the excavator, that is, in the left-right direction near the upper end. A slit 46 is formed in the upper and lower portions of the shaft support hole 45, and a bolt hole 47 is formed in the front-rear direction through the upper slit 46. The support bracket 17 can rotate the shaft of the upper roller 18 by tightening a bolt (not shown) in the bolt hole 47 with the shaft of the upper roller 18 inserted into the shaft support hole 45 from the outside of the excavator. Hold.

  The side plate 27 is a side surface facing the center side in the left-right direction of the lower traveling device 1, and a lower end portion is welded to the bottom plate 25 and an upper end portion is welded to the top plate 26.

  Further, the side plate 28 is an outer side surface in the left-right direction of the lower traveling device 1, and a lower end portion is welded to the bottom plate 25 and an upper end portion is welded to the top plate 26, respectively. An inspection window 51 is provided as an opening through which the fat draining part 23 faces. The inspection window 51 has a front-rear dimension that allows the greasing / disposal part 23 to be accessed from the outside even when the greasing / discharging part 23 slides in the front-rear direction as the adjustment group 19 slides.

  The reinforcing bracket 29 includes, for example, reinforcing brackets 29a, 29b, and 29c provided in the left-right direction in the traveling frame 2 between the supporting brackets 17 and 17, and is attached to the plates 25, 26, 27, and 28, respectively. Thus, the traveling frame 2 is reinforced.

  Further, the front end of the adjuster cylinder 22 is fixed to the reinforcing bracket 29a, and the adjuster cylinder 22 is inserted into the insertion hole 53 formed in the front-rear direction at the center of the reinforcing bracket 29b. A not-shown insertion notch hole in which the upper end is fixed to the top plate 26 by a bolt (not shown) fastened to a bolt hole 54 formed in the top plate 26 in the width direction, and is notched from the vicinity to the lower end. The spring group 21 and the sliding plate 36 are inserted into the first and second plates.

  As shown in FIGS. 4 (a) and 4 (b), the idler support 13 is located on both sides of the idler 14 and rotatably supports both ends of the idler shaft 56 of the idler 14. 57 and a support 58 integrally welded to the idler bracket 57.

  In the idler bracket 57, sliding portions 59 are respectively provided on the upper and lower sides of the idler shaft 56 on the outer surface which is the side surface not facing the idler 14. These sliding portions 59 are guided in the front-rear direction along idler guides 61 protruding from the frame plate 31 of the traveling frame 2.

  Further, the support 58 is provided with a connecting portion 62 connected to the idler bracket 57 projecting on both sides of the front end portion, and a seat surface portion 63 that holds the front end portion of the spring group 21 at the rear end portion. Yes. The support 58 has a sliding hole 64 formed in the central portion in the axial direction, and a concave accommodating portion 65 communicating with the front side of the sliding hole 64 is formed inside.

  Further, a convex portion 66 projects in the radial direction on the upper portion of the support 58 on the rear end side. The convex portion 66 is long in the front-rear direction from the front end portion of the seat surface portion 63 toward the connection portion 62. A support cover 67 is attached to the upper part of the support 58.

  Here, as shown in FIG. 3, the connecting portion 62 has a pair of bolt holes 68, 68, respectively. The bolt holes 68, 68 are tightened with bolts (not shown) so that the idler bracket 57 and the support 58 are tightened. And become one.

  As shown in FIGS. 1 and 4, the spring group 21 is slid onto the support 58 through a spring portion 71 formed in an elongated cylindrical shape and having a front end portion connected to the support 58, and the center portion of the spring portion 71. And a recoil rod 72 as a rod inserted in a movable manner.

  The spring portion 71 includes a recoil spring 74 as an urging body and a spring case 75 as a case in which the recoil spring 74 is accommodated.

  The recoil spring 74 has a front end portion held at the rear end portion of the support 58 and a rear end portion held at the rear end portion in the spring case 75, and can be expanded and contracted in the front-rear direction. The recoil spring 74 absorbs a sudden change in the tension of the crawler belt 15 by expansion and contraction.

  The spring case 75 includes a cylindrical outer cylinder 76 that covers the outside of the recoil spring 74, and a cylindrical inner cylinder 77 that is provided coaxially with the outer cylinder 76 and covers the inside of the recoil spring 74. A cylindrical portion 78 in which the rear end portion of the support 58 is slidably inserted into the opening, and a plate 79 as an end plate portion provided at the rear end portion of the cylindrical portion 78, and the reinforcing bracket 29c. Is inserted through the notch hole.

  The outer cylinder 76 has a front end portion slidably engaged with the outer surface of the support 58, a rear end portion welded and fixed to the outer surface of the plate 79, and a lower portion supported by the sliding plate 36. . Further, a groove portion 81 into which the convex portion 66 can be fitted is formed in the upper portion on the front end side of the outer cylinder 76 by notching it in the axial direction. As shown in FIGS. 1 and 2, the groove portion 81 is formed in a long hole shape in the front-rear direction, has a width dimension substantially equal to the convex portion 66, and is formed in both directions at the front end portion of the outer cylinder 76. A widened portion 81a is formed. Further, the lower portion of the outer cylinder 76 is slidably fitted into a sliding groove 82 provided in the front-rear direction at the lower end of the support 58.

  The inner cylinder 77 has an axial dimension shorter than that of the outer cylinder 76, the recoil rod 72 is inserted through the center, and the rear end is fixed to the plate 79 together with the outer cylinder 76. Therefore, the front end surface of the inner cylinder 77 is located on the rear side with respect to the front end surface of the outer cylinder 76, and the stopper portion 83 protrudes rearward from the inner edge portion of the seat surface portion 63 of the support 58. Are opposed to each other. Therefore, the distance between the front end surface of the inner cylinder 77 and the stopper portion 83 is the slide stroke of the spring portion 71.

  Further, the plate 79 is formed in a substantially cylindrical shape and is integrally welded to the outer cylinder 76 and the inner cylinder 77, and a seat surface portion 85 that holds the rear end portion of the recoil spring 74 is provided at the front end portion, and An abutting portion 86 that abuts against the rear end surface of the inner cylinder 77 is projected at the inner edge of the seat surface portion 85. Further, a screw hole 87 into which the recoil rod 72 is inserted and screwed is provided at the center of the plate 79.

  The recoil rod 72 includes a cylindrical rod body 88 that is inserted into the plate 79 and the inner cylinder 77. The rod body 88 has a front end slidably inserted into the slide hole 64 of the support 58. A recoil nut 89 for retaining is attached to the outer peripheral surface, and a screw portion 90 to be screwed into the screw hole 87 is provided on the outer peripheral surface of the rear end portion, and a retaining portion is provided on the rear side of the screw portion 90. The rod head 91 is integrally provided to regulate the length of the recoil spring 74. The recoil nut 89 has a washer 92 attached to the rear end, a plate 93 that prevents the recoil nut 89 from rotating around the front end via a pair of bolts 94, and a support cover at the top. It is covered with 67 so that it is not exposed to the outside.

  The adjuster cylinder 22 has a substantially cylindrical cylinder portion 95 serving as an outer frame and an adjuster piston 96 inserted into the cylinder portion 95, and a supply / discharge grease portion 23 is provided on the outer side of the cylinder portion 95. In addition, a display plate 97 is provided in the vicinity of the oil supply / drainage section 23.

  As shown in FIG. 4, the cylinder portion 95 has a head fitting chamber 101 into which the rod head 91 is fitted at the front end portion, and a piston chamber 102 into which an adjuster piston 96 is slidably inserted. In addition, a grease chamber 103 that communicates with the oil supply / drainage portion 23 is provided toward the head fitting chamber 101 at the front end of the piston chamber 102. Then, on the outer peripheral surface of the head fitting chamber 101 which is the front end side of the cylinder portion 95, as shown in FIG. 1, the rod head 91 is fitted to the outer peripheral surface of the rod head 91 with respect to the cylinder portion 95. A pin hole 104 into which a pair of retaining pins (not shown) for retaining and preventing rotation is inserted is formed in the radial direction.

  On the other hand, as shown in FIG. 4, the adjuster piston 96 is provided in a substantially cylindrical shape, and the front end portion is inserted into the piston chamber 102 and the rear end portion protrudes from the cylinder portion 95 and is fixed to the reinforcing bracket 29a. ing. On the front end side of the adjuster piston 96, a plurality of adjuster seals 106 that are in sliding contact with the inner peripheral surface of the piston chamber 102 are fitted on the outer peripheral surface.

  Further, as shown in FIG. 5, the supply / drainage part 23 is located between the reinforcing brackets 29 b and 29 c and serves as a working fluid supply part capable of supplying grease to the piston chamber 102 via the grease chamber 103. It is provided with a fill valve 111 which is a greasing part, that is, a grease nipple, and a relief valve 112 as a working fluid discharge part capable of discharging the grease supplied into the piston chamber 102 to the outside, and each of these valves 111 and 112 has a stopper plate. 113 is fitted and exposed to the outside of the traveling frame 2 from the inspection window 51 together with the display plate 97.

  The fill valve 111 is screwed into a fill valve mounting hole (not shown) that is drilled in the side portion of the cylinder portion 95 and communicates with the grease chamber 103, and the distal end portion communicates with the grease chamber 103, and the base end portion is a cylinder. Projects radially from the portion 95.

  The fill valve 111 can inject grease from the outside, and does not discharge the grease in the grease chamber 103 to the outside until the pressure of the grease in the grease chamber 103 reaches a predetermined value. When the grease pressure in the chamber 103 reaches a predetermined value, the grease in the piston chamber 102 is released to the outside through the grease chamber 103 from the relief port 115 communicating from the side of the fill valve mounting hole to the side of the cylinder portion 95. By letting it escape, the pressure of the grease in the piston chamber 102 is maintained within a predetermined range.

  The relief valve 112 is installed by screwing into a relief valve mounting hole (not shown) that is drilled in the vicinity of the fill valve mounting hole on the side of the cylinder portion 95 in the axial direction and communicates with the grease chamber 103. The base end portion projects from the cylinder portion 95 in the radial direction while communicating with the chamber 103.

  The relief valve 112 is for discharging the grease in the grease chamber 103 to the outside. By loosening the screw into the cylinder portion 95, the relief valve 112 is moved from the side of the relief valve mounting hole to the side of the cylinder portion 95. The grease in the piston chamber 102 can be discharged to the outside through the grease chamber 103 from the discharge port 116 communicating with the valve.

  Next, a procedure for assembling the traveling device according to the embodiment shown in FIGS. 1 to 5 will be described.

  First, a plate 79 is welded and fixed to the rear end portion of the cylindrical portion 78 containing the recoil spring 74, and the recoil rod 72 is inserted into the screw hole 87 of the plate 79 from the rear side so that the screw portion 90 is inserted into the screw hole 87. The rod body 88 of the recoil rod 72 is inserted through the central portion of the cylindrical portion 78 by screwing.

  Next, the rear end portion of the support 58 of the idler support 13 is fitted into the opening of the front end portion of the cylindrical portion 78, the convex portion 66 is fitted into the groove portion 81, and the lower portion side of the front end portion of the outer cylinder 76 is connected to the sliding groove portion 82. And the front end portion of the recoil rod 72 is inserted into the sliding hole 64.

  Thereafter, a recoil nut 89 is attached to the front end portion of the recoil rod 72 via a washer 92, and the plate 93 is fixed to the recoil nut 89 with a bolt 94.

  Then, the connecting portion 62 of the support 58 is connected to an idler bracket 57 that pivotally supports both end portions of the idler shaft 56 of the idler 14.

  Further, the rod head 91 of the recoil rod 72 is fitted into the head fitting chamber 101 of the adjuster cylinder 22, and a retaining pin is inserted into the pin hole 104 to connect the spring group 21 and the adjuster cylinder 22, thereby adjusting the adjustment group. 19 is constructed integrally.

  Next, the valves 111 and 112 are respectively screwed into the valve mounting holes of the cylinder portion 95, and the stopper plate 113 is attached.

  Thereafter, the idler 14, the idler support 13, and the adjustment group 19 that are integrally connected to each other are connected to the bottom plate 25 of the traveling frame 2 through the bracket 37 through the bracket plate 36 and the front end side of the traveling frame 2. Then, the adjuster piston 96 is fixed to the reinforcing bracket 29a so that the oil supply / drainage portion 23 is exposed from the inspection window 51.

  Further, the lower roller 16 and the upper roller 18 are respectively attached to predetermined positions, and the crawler belt 15 is wound around the traveling frame 2 from the idler 14 to the sprocket 12.

  Then, by injecting grease from the fill valve 111 into the piston chamber 102, the cylinder portion 95 moves forward relative to the adjuster piston 96, and the idler 14 is moved through the spring group 21 and the idler support 13. Then, the crawler belt 15 is moved in the forward direction, which is the direction in which the crawler belt 15 is stretched, and the tension of the crawler belt 15 is adjusted to a predetermined amount.

  Next, functions and effects of the embodiment shown in FIGS. 1 to 5 will be described.

  When tension is generated in the crawler belt 15 during traveling of the hydraulic excavator, the adjustment group 19 is pushed by the tension and the tension is absorbed by the recoil spring 74.

  In addition, when an impact force is applied to the crawler belt 15 or when the crawler belt 15 bites a foreign object such as a rock or a reinforcing bar, excessive tension is generated in the crawler belt 15, and the recoil spring 74 alone absorbs the tension. When the internal pressure exceeds the predetermined value, the grease in the piston chamber 102 is discharged from the relief port 115 to the outside by the action of the fill valve 111, and the internal pressure in the adjuster cylinder 22 is exceeded. The pressure is reduced to a predetermined value, and the adjustment group 19 operates in the direction of loosening the crawler belt 15.

  The spring group 21 is prevented from rotating in the circumferential direction with respect to the idler support 13 that is prevented from rotating by the traveling frame 2, and the adjuster cylinder 22 is prevented from rotating in the circumferential direction relative to the spring group 21. 22 prevents rotation of the fill valve 111 with respect to the inspection window 51 when the spring group 21 of the adjustment group 19 or the adjuster cylinder 22 is operated. Accessibility can be secured, maintainability of the excavator can be improved, greasing work is not hindered, and work efficiency can be prevented from being lowered.

  Specifically, the spring group 21 is provided with a groove 81 in the axial direction in which the convex portion 66 protruding from the support 58 of the idler support 13 is fitted in the front end portion of the cylindrical portion 78 of the spring case 75 of the spring group 21. 21 can be reliably prevented from rotating with respect to the idler support 13, and for example, no separate member is required to be assembled, and an increase in manufacturing cost due to an increase in the number of parts can be prevented.

Further, while fixing the rear end portion to the adjuster cylinder 22, a screw portion 90 provided at the rear end portion of the recoil rod 72 slidably inserted into the support 58 of the idler support 13 through the spring case 75 through the front end side, By screwing into the screw hole 87 of the plate 79 of the spring case 75, the adjuster cylinder 22 can be reliably prevented from rotating with respect to the spring group 21, and screw processing is added to the normal spring case 75 and recoil rod 72, respectively. Therefore, for example, it is not necessary to assemble a separate member or the like, and an increase in manufacturing cost accompanying an increase in the number of components can be prevented more reliably.

  Furthermore, by forming the widened portion 81a that is widened in both sides at the front end portion of the groove portion 81, the convex portion 66 can be easily fitted into the groove portion 81 when the support 58 is inserted into the cylindrical portion 78. Assembling property can be improved.

  And by providing the fill valve 111 and the relief valve 112 integrally as the oil supply / drainage part 23, the accessibility to the relief valve 112 from the outside can be secured in the same way as the fill valve 111, thus improving the workability. it can.

  In the embodiment shown in FIGS. 1 to 5, it is possible to use the lower traveling device 1 for a work machine other than a hydraulic excavator.

It is side surface sectional drawing which shows the principal part of one Embodiment of the traveling apparatus which concerns on this invention. It is a bottom view which shows the principal part of a traveling apparatus same as the above. It is a front view which shows the principal part of a traveling apparatus same as the above. (A) is a top view of a traveling apparatus same as the above, (b) is a side view of a traveling apparatus same as the above. It is a side view which shows the inside of the traveling frame of a traveling apparatus same as the above. It is a perspective view which shows the working machine provided with the traveling apparatus same as the above.

DESCRIPTION OF SYMBOLS 1 Lower traveling apparatus as traveling apparatus 2 Traveling frame 3 Upper revolving structure as a revolving structure 5 Working apparatus
12 Sprocket as drive wheel
13 Idler support as a wheel support
14 Idler as a driven wheel
15 tracks
21 Spring group as a biasing means
22 Adjuster cylinder as cylinder
51 Inspection window as opening
66 Convex
72 Recoil rod as rod
74 Recoil spring as biasing body
75 Spring case as a case
78 Tube
79 Plate as end plate
81 Groove
95 cylinder
96 adjuster piston
111 Fill valve as working fluid supply

Claims (5)

A traveling frame that is long in the traveling direction and has an opening on the outside;
A drive wheel provided at one end of the traveling frame and driven to rotate;
A wheel support provided on the other end of the traveling frame so as to be movable and adjustable,
A driven wheel pivotally supported by the roller support;
An endless crawler belt wound around the traveling frame across the driven wheel and the drive wheel;
It is accommodated in the traveling frame, is formed in a cylindrical shape, is prevented from rotating in the circumferential direction with respect to the wheel support, and energizes the driven wheel in the direction in which the crawler belt is stretched through the wheel support. Means,
A cylinder part which has a working fluid supply part facing the opening of the traveling frame at the side and is movable in the longitudinal direction with respect to the traveling frame and is prevented from rotating in the circumferential direction with respect to the urging means, and the cylinder part And a cylinder for adjusting the urging force of the urging means , which is provided on the opposite side of the wheel support with respect to the urging means. A traveling device characterized by that. The biasing means is
An urging body for urging the driven wheel in a direction in which the crawler belt is stretched through the wheel support;
A cylindrical portion containing the urging body, an end plate provided at one end of the cylindrical portion, and a case having a groove provided in the axial direction at the other open end of the cylindrical portion,
The running wheel according to claim 1, wherein the wheel support is provided with a convex portion that is slidably inserted at one end of the case, and that protrudes from the one end and can be fitted into a groove of the case. apparatus. A traveling frame that is long in the traveling direction and has an opening on the outside;
A drive wheel provided at one end of the traveling frame and driven to rotate;
A wheel support provided on the other end of the traveling frame so as to be movable and adjustable,
A driven wheel pivotally supported by the roller support;
An endless crawler belt wound around the traveling frame across the driven wheel and the drive wheel;
It is accommodated in the traveling frame, is formed in a cylindrical shape, is prevented from rotating in the circumferential direction with respect to the wheel support, and energizes the driven wheel in the direction in which the crawler belt is stretched through the wheel support. Means,
A cylinder accommodated in the traveling frame and provided with a working fluid supply portion facing the opening of the traveling frame on the side, and adjusts the urging force of the urging means and is prevented from rotating in the circumferential direction with respect to the urging means And
The biasing means is
An urging body for urging the driven wheel in a direction in which the crawler belt is stretched through the wheel support;
A cylindrical portion containing the urging body, an end plate provided at one end of the cylindrical portion, and a case having a groove provided in the axial direction at the other open end of the cylindrical portion,
The wheel support is provided with a convex portion that is slidably inserted into the case at one end, protrudes from the one end, and fits into a groove of the case. The urging means includes a rod having one end fixed to the cylinder and the other end slidably inserted into the wheel support through the end plate portion of the case to regulate the length of the urging body,
The travel device according to claim 2 or 3, wherein one end of the rod is screwed to the end plate portion of the case. A traveling device according to any one of claims 1 to 4,
A swivel body that is turnably provided on the traveling device;
A work machine comprising: a work device operably provided on the swivel body.

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