Work machine

Abstract

To provide a work machine of which space usage below a cabin is improved for a vibration prevention structure of the cabin.SOLUTION: An excavation work machine is provided with: a cabin placed on a left side in a left / right direction of a revolving frame 7; and an excavation device supported in front of the revolving frame 7 to rotate in the left / right direction through motion of a swing cylinder 38, wherein the swing cylinder 38 is placed below the cabin and a mount 82a among a plurality of mounts 82a, 82b, 82c, 82d supporting the cabin supports a right side in the left / right direction of the cabin above the swing cylinder 38.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a work machine equipped with a cabin. [Background technology]

[0002] A conventional working machine includes a self-propelled lower traveling body, an upper rotating body that is rotatably provided above the lower traveling body, and a working machine that is supported on the front part of the upper rotating body so as to be vertically rotatable. The upper rotating body includes a rotating frame that forms a support structure, and a cabin in which an operator who operates the working machine sits is mounted on the upper part of the rotating frame.

[0003] Between the revolving frame and the cabin, a vibration-proof structure is provided to reduce vibrations transmitted to the cabin through the revolving frame during work. Known examples of vibration-proof structures include a vibration-proof material provided between the revolving frame and the cabin. For example, in the work machine disclosed in Patent Document 1, vibration-proof materials are provided at the four corners of the rectangular bottom plate of the cabin. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6647997 Summary of the Invention [Problem to be solved by the invention]

[0005] The vibration-proof material employed in the vibration-proof structure of the cabin of the working machine disclosed in Patent Document 1 is a so-called liquid-filled mount having a cylindrical container portion that seals a viscous fluid. When the cabin is supported by such a vibration-proof material, the vibration-proof material is disposed in a space at a certain height between the revolving frame and the floor plate of the cabin. On the other hand, when attempting to use the space between the bottom plate of the cabin and the revolving frame to place some member, the other member must be disposed in a position that does not interfere with the container portions of the four vibration-proof materials disposed below the bottom plate of the cabin. As described above, there is a problem in that the use of the space below the cabin is physically restricted by the vibration-proof material, and therefore the configuration that can be placed in the space below the cabin is limited.

[0006] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a work machine in which the vibration-proof structure of the cabin improves the utilization of the space below the cabin. [Means for solving the problem]

[0007] The work machine of the present invention comprises a cabin arranged on one side of the body frame in the left-right direction, and an excavation device supported in front of the body frame so as to rotate left and right by the operation of a swing cylinder, the swing cylinder being arranged below the cabin.

[0008] A work machine according to another aspect of the present invention includes a first mount that supports the other side of the cabin in the left-right direction above the swing cylinder.

[0009] A work machine according to another aspect of the present invention includes a second mount that supports one side of the cabin in the left-right direction and is disposed lower than the first mount.

[0010] In a work machine according to another aspect of the present invention, the second mount is disposed at a position facing the swing cylinder.

[0011] A working machine according to another aspect of the present invention includes a third mount and a fourth mount which support the cabin rearward of the first mount and the second mount, and the swing cylinder is disposed between the third mount and the fourth mount.

[0012] In a work machine according to another aspect of the present invention, the third mount and the fourth mount are disposed below the first mount.

[0013] In another aspect of the present invention, the work machine has a body frame that includes a vertical plate extending in the fore-aft direction next to the swing cylinder, the first mount is arranged on one side of the vertical plate in the left-right direction, and the fourth mount is arranged on the other side of the vertical plate in the left-right direction. Effect of the Invention

[0014] According to the present invention, in a vibration isolation structure that supports a cabin in a vibration-isolating manner, the space below the cabin can be utilized more efficiently by devising an arrangement of multiple vibration isolation materials. [Brief description of the drawings]

[0015] [Figure 1] 1 is a left side view of an excavation machine according to an embodiment of the present invention. FIG. [Diagram 2] 1 is a perspective view of an excavation work machine according to an embodiment of the present invention, seen from the left front. [Diagram 3] 1 is a perspective view of an excavation work machine according to an embodiment of the present invention, seen from the left rear. [Figure 4] FIG. 2 is a perspective view showing the arrangement of a cabin on a rotating frame of an excavation machine according to an embodiment of the present invention. [Diagram 5] FIG. 2 is a plan view showing the arrangement of a cabin on a rotating frame of the excavation machine according to one embodiment of the present invention. [Figure 6] FIG. 2 is a perspective view showing a support structure of a cabin according to one embodiment of the present invention. [Figure 7]FIG. 2 is a plan view showing a support structure of a cabin according to one embodiment of the present invention. [Figure 8] FIG. 2 is a front view showing a front support structure of a cabin according to one embodiment of the present invention. [Figure 9] 1 is a perspective view of a front support structure of a cabin according to one embodiment of the present invention, viewed from below and rearward. FIG. [Figure 10] 1 is a perspective view of a front support structure of a cabin according to one embodiment of the present invention, viewed from above and to the front. FIG. [Figure 11] FIG. 2 is a cross-sectional view of a front support structure of a cabin according to one embodiment of the present invention. [Figure 12] 11A and 11B are diagrams showing a modified example of a front support structure of a cabin according to an embodiment of the present invention. [Figure 13] 11A and 11B are diagrams showing a modified example of a front support structure of a cabin according to an embodiment of the present invention. [Figure 14] 11A and 11B are diagrams showing a modified example of a front support structure of a cabin according to an embodiment of the present invention. [Figure 15] 11A and 11B are diagrams showing a modified example of a front support structure of a cabin according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The present invention aims to improve the degree of freedom in arranging components in the space below the cabin of a work machine by devising an attachment structure for vibration-proofing materials in the configuration below the cabin. Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0017] In this embodiment, an excavation work machine, which is a slewing work vehicle, will be described as an example of the work machine according to the present invention. However, the work machine according to the present invention is not limited to excavation work machines, and can be widely applied to other work machines such as crane work machines, skid steer loaders, wheel loaders, etc.

[0018] The following describes the overall configuration of an excavation machine 1 according to this embodiment. As shown in Figures 1 to 3, the excavation machine 1 is provided with an excavation device 3 and a soil removal device 4 as working machines on a self-propelled traveling vehicle body (machine body) made up of a lower traveling body 2A and an upper rotating body 2B.

[0019] The lower traveling body 2A has a pair of left and right crawler-type traveling parts 5,5 and a machine frame 6 interposed between the left and right traveling parts 5,5 as a base.

[0020] The traveling unit 5 has a configuration in which a crawler belt is wound around a sprocket, an idler, and a plurality of rollers supported by the machine frame 6. The traveling unit 5 has a drive sprocket 5a, which is a drive wheel, at its rear end.

[0021] The soil removal device 4 is attached to the front side of the machine frame 6. The soil removal device 4 includes a support frame 40 and a blade 41, which is a blade supported by the support frame 40. The soil removal device 4 including these components is configured to be substantially symmetrical overall.

[0022] The support frame 40 is supported on the lower running body 2A so as to be vertically rotatable, and includes left and right arms 43 extending in the front-rear direction between the left and right running parts 5, 5. The left and right arms 43 have their base ends supported on support brackets 42 provided on the front part of the machine frame 6 with the left and right direction being the rotation axis direction. The support frame 40 rotates vertically by the extension and contraction of a blade cylinder 44. In other words, the blade 41 rotates vertically via the support frame 40 as the blade cylinder 44 extends and contracts.

[0023] The upper rotating body 2B has a rotating frame 7 mounted so as to be rotatable relative to the lower traveling body 2A. The rotating frame 7 is connected to the machine body frame 6 via a rotating bearing 8, and is provided so as to be rotatable in either the left or right direction about an axis whose axial direction is in the up-down direction relative to the machine body frame 6 by driving a rotating motor (not shown). This connection between the machine body frame 6 and the rotating frame 7 allows the upper rotating body 2B to rotate relative to the lower traveling body 2A.

[0024] An excavation device 3 is attached to the front side of the upper rotating body 2B. The excavation device 3 has a boom 32 that constitutes the base side thereof, an arm 33 connected to the tip side of the boom 32, and a bucket 34 attached to the tip of the arm 33. The excavation device 3 also has a boom cylinder 35 that rotates the boom 32, an arm cylinder 36 that rotates the arm 33, and a bucket cylinder 37 that rotates the bucket 34.

[0025] A base end of the boom 32 is supported by a boom support bracket 31. The boom support bracket 31 is supported by a bracket attachment portion 28 (see FIG. 1) protruding from the revolving frame 7 via a swing shaft whose rotation axis is in the vertical direction.

[0026] The boom support bracket 31 has a boom support part 22 that rotatably supports the base end of the boom 32 with the left-right direction as the rotation axis direction, a boom cylinder support part 23 that supports the lower end of the boom cylinder 35, and a swing cylinder connection part 25 that connects the tip of the rod of the swing cylinder 38. When the swing cylinder 38 operates to rotate the boom support bracket 31 about the swing axis, the excavation device 3 rotates left and right.

[0027] The boom cylinder 35, arm cylinder 36, bucket cylinder 37 and swing cylinder 38 are all hydraulic cylinders that are operated by pressure oil discharged from a hydraulic pump (not shown). In the excavation device 3, the bucket 34 is detachably attached as a work attachment, and other attachments such as a clamping machine (fork) or a crusher (breaker) are attached in place of the bucket 34 depending on the work content.

[0028] The upper rotating body 2B is provided with a cabin 10 that houses a driving section where an operator drives and operates the traveling section 5 and the work machine, a prime mover section 11 that houses an engine, a battery, etc., and a tank section 12 that houses a fuel tank for the engine and a hydraulic oil tank for the hydraulic cylinder. In a plan view, the cabin 10 is disposed in the front left part on the rotating frame 7, and the tank section 12 is disposed to the right of the cabin 10. In addition, the prime mover section 11 is disposed behind the cabin 10 on the rotating frame 7. Furthermore, a counterweight 9 for balancing the weight with the excavation equipment 3 is attached to the rear side of the upper rotating body 2B.

[0029] The rear of the prime mover unit 11 of the upper rotating body 2B is covered by a counterweight 9 and a rear cover 13. The left lower side of a cabin 10 of the upper rotating body 2B is covered by a lower left exterior cover 14, and the front lower side of the cabin 10 is covered by a front exterior cover 15. By removing the lower left exterior cover 14 and the front exterior cover 15, maintenance of parts and the like arranged below the bottom plate of the cabin 10 is possible.

[0030] A driver's seat is provided inside the cabin 10, and around the driver's seat are a travel lever for driving the lower running body 2A, a plurality of operation pedals for rotating the upper rotating body 2B and operating the work equipment, a work operation lever, an operation panel section, etc.

[0031] In the excavator 1 having the above-mentioned configuration, the desired motion and work are performed by the operator in the cabin 10 appropriately operating the travel lever, work operation lever, etc. For example, operation of the travel lever causes the traveling section 5 to travel forward and backward in a straight line or to turn left and right, and operation of the work operation lever causes the excavation device 3 to perform excavation work, or the soil removal device 4 to perform soil removal and ground leveling work.

[0032] A further explanation will be given of the revolving frame 7 on which the cabin 10 is disposed and the vibration-proof structure of the cabin 10. Note that in Fig. 2 and Fig. 4 to Fig. 7, the bracket attachment portion 28 of the revolving frame 7 is omitted from illustration.

[0033] First, we will explain the configuration of the revolving frame 7. The revolving frame 7 is a support structure for the upper revolving body 2B, and has a base plate 71, a left vertical rib 72 and a right vertical rib 73 which are reinforcing members provided on the left and right sides across the front and rear of the base plate 71, and a front horizontal rib 74 and a rear horizontal rib 75 which connect the left vertical rib 72 and the right vertical rib 73 on the front and rear sides of the base plate 71.

[0034] The base plate 71 has a shape in which the left and right ends and the rear end are formed in a substantially arc shape in a plan view. Note that the term "substantially arc shape" as used here does not only refer to a simple arc, but also includes a shape in which multiple arcs with different central angles are connected and a shape that includes some straight lines. A hole 78 is provided in the center of the base plate 71, which serves as the center of rotation, from which the tip of a swivel joint 79, the base end of which is fixed to the aircraft frame 6, protrudes.

[0035] The right vertical rib 73 is provided linearly along the front-rear direction. The left vertical rib 72 is provided parallel to the right vertical rib 73 at its rear side and is bent at an angle so that its front end is shifted to the right.

[0036] A support plate 76 extending leftward from the side surface of the left vertical rib 72 is provided on the left rear side of the base plate 71. The support plate 76 supports a swing cylinder support part 77 that supports the base end part of the swing cylinder 38, and also functions as a partition wall that separates the arrangement area of ​​the cabin 10 on the base plate 71 from the arrangement area of ​​the prime mover part 11.

[0037] A cabin installation portion 80 is provided on the substrate 71 (see Figs. 6 and 7). The cabin 10 is supported in a vibration-proof manner by a vibration-proof structure provided on the cabin installation portion 80.

[0038] Furthermore, in the excavator 1 according to this embodiment, in order to ensure a forward / rearward movable range of the boom 32 to the right of the cabin 10, it is necessary to attach the boom support bracket 31 to the right of the cabin installation section 80 on the revolving frame 7. For this reason, the attachment position of the boom support bracket 31 on the base plate 71 is slightly to the right of the front center of the base plate 71.

[0039] The configuration of the cabin 10 will be described. As shown in Figs. 1 to 5, the cabin 10 has a substantially rectangular box-like outer shape, and is composed of a frame 51 constituting an exoskeleton, and a ceiling, floor, walls, doors, windows, etc. supported by the frame 51. The term "substantially rectangular box-like" as used here does not only refer to a simple rectangular parallelepiped, but also includes shapes that are polygonal in plan and side views, and shapes that include inclined or curved surfaces on part of the outer surface.

[0040] An access door 55 is provided on the left side of the cabin 10 so as to be able to open and close, and the operator can get in and out of the cabin 10 via the access door 55. A plurality of windows 56a, 56b, 56c, 56d, 56e, 56f, 56g are provided on the front, rear, left and right sides of the cabin 10 by fitting transparent plates such as glass into the frame body 51 and the door frame of the access door 55. This allows the operator in the cabin 10 to visually check the situation around the excavation machine 1 from the driver's seat. In addition, a window 56g is provided on the front side of the ceiling 52 of the cabin 10, so that the operator can visually check for obstacles above.

[0041] The outer shape of the revolving frame 7 is designed to have an arc-shaped curve such that its rear end is within the left-right width of the left and right running parts 5, 5 when revolving. The shape of the cabin 10 in plan view is not a rectangle but an approximate pentagon (see FIG. 5). That is, the right side of the cabin 10 is the boundary with the front-rear movable area of ​​the boom 32 and is linear in plan view, but the left side is shaped with two sides sandwiching an obtuse angle so as to follow the outer contour of the revolving frame 7. Therefore, the shape of the cabin 10 in plan view is an approximate pentagon. By making the shape of the cabin 10 in plan view a shape that fits within the outer contour of the revolving frame 7, the upper revolving body 2B can revolve within the left-right width of the left and right running parts 5, 5. That is, the excavation machine 1 is configured to be capable of small rearward turning work.

[0042] 4, a rear wall 58 of the cabin 10 is provided with a tapered portion 59 that is inclined from the rear to the front of the cabin 10 so that the upper side of the cabin 10 protrudes rearward beyond the lower end of the cabin 10. As a result, the area of ​​the ceiling 52 of the cabin 10 is larger than the area of ​​the bottom, and the center of gravity (center of mass) of the cabin 10 is located toward the rear.

[0043] Cabin 10 has a driver's section support plate (not shown) that constitutes the floor, and a bottom frame 61 that surrounds the driver's section support plate. The driver's section support plate and the bottom frame 61 are connected to each other to constitute the bottom plate of cabin 10. In the configuration on the revolving frame 7 in Figures 6 and 7, the driver's section support plate is not shown, and the bottom frame 61 is shown in a state where it is placed on a cabin installation section 80, which will be described later.

[0044] The bottom frame 61 of the cabin 10 includes a front frame plate 63a, a left frame plate 63b, a rear frame plate 63c, and a right frame plate 63d. The front frame plate 63a, the left frame plate 63b, the rear frame plate 63c, and the right frame plate 63d are each made of long plate materials having different shapes, and their ends are connected to each other by fastening members such as bolts to form the bottom frame 61 having a substantially rectangular shape in a plan view. The bottom frame 61 includes reinforcing members 64 that reinforce the spaces between the frame plates as necessary. Here, the term "substantially rectangular" includes not only a simple rectangle, but also a quadrangle with different lengths of sides and a polygon with obtuse corners on some of the four sides.

[0045] The front frame plate 63a has a protruding portion 65 that protrudes upward in a convex shape at the right end of the flat plate surface. The protruding portion 65 is configured so that a mount 82a serving as a vibration-proof material, which will be described later, can be accommodated in its internal space.

[0046] The support structure of the cabin 10 will be described. The cabin installation section 80 on which the cabin 10 is installed on the base plate 71 of the revolving frame 7 is provided with a vibration-proof structure including a plurality of (four in this embodiment) vibration-proof materials, as shown in Figs. 6 and 7. More specifically, four supports 81a, 81b, 81c, and 81d (hereinafter, when the supports 81a, 81b, 81c, and 81d are collectively referred to as supports 81) fixed on the base plate 71 and four mounts 82a, 82b, 82c, and 82d (hereinafter, when the mounts 82a, 82b, 82c, and 82d are collectively referred to as mounts 82) supported by each support 81 and connected to the bottom plate of the cabin 10 are arranged. The supports 81 and the mounts 82 are arranged at positions corresponding to the four corners of the bottom of the approximately rectangular shape of the cabin 10, respectively.

[0047] The front of the cabin 10 is supported by a forward vibration isolation structure 98 including a right front support 81a, a right front mount 82a, a left front support 81b and a left front mount 82b, and the rear is supported by a rear vibration isolation structure 99 including a left rear support 81c, a left rear mount 82c, a right rear support 81d and a left rear mount 82d.

[0048] The supports 81 each have a predetermined length (height) in the vertical direction, and are fixed to the base plate 71 of the revolving frame 7 by welding or the like. The predetermined length (height) here is, for example, about 1.2 to 1.5 times the cylinder diameter of the swing cylinder 38, and is a length that is higher than the height of a cylinder of a container part 83 in the mount 82, which will be described later. These supports 81 form a space between the base plate 71 and the bottom plate of the cabin 10 in which members can be arranged. Therefore, the swing cylinder 38 can be arranged between the base plate 71 and the bottom plate of the cabin 10 by diagonally crossing under the cabin 10. Note that the dimensions (heights) in the vertical direction of each support 81 do not need to be the same, and a length appropriate for each position is selected in consideration of the shape of the bottom plate of the cabin 10, etc.

[0049] Each of the supports 81 is formed into a predetermined shape by bending and / or welding a metal plate material. More specifically, the support 81a has a substantially C-shape in front view in order to secure a space for the cylinder rod of the swing cylinder 38 to protrude from the front end of the revolving frame 7 and pass through it in an expandable and contractible manner. The support 81b has a substantially C-shape in front view and a substantially L-shape in plan view. The support 81c has a substantially inverted U-shape in side view. Note that the "U-shape" is not limited to a smoothly curved shape, but includes a shape in which the bottom of the U-shape is flat. The "inverted U-shape" refers to an arrangement in which the two ends of the U-shape are arranged downward and the U-shape opens downward. The support 81d has a substantially L-shape in side view, with one end of the L-shape fixed to the base plate 71 and the other end fixed to the rear transverse rib 75. In this way, the shapes of each support body 81 do not need to be the same as long as they have the rigidity (section modulus equal to or greater than a predetermined value) sufficient to withstand the load of the cabin 10, and an appropriate shape is selected in relation to the outer shape of the rotating frame 7, the arrangement of the left vertical rib 72 and rear horizontal rib 75, and the specifications of the mount 82, etc.

[0050] The mount 82 is a vibration-proof material that absorbs vibrations transmitted to the revolving frame 7 via the boom support bracket 31 during excavation work and suppresses the transmission of vibrations to the cabin 10 in which the operator sits. The mount 82 is, for example, a liquid-filled mount, and includes a cylindrical container portion 83 that contains a viscous fluid therein, an elastic body 84 provided above the container portion 83, and a stud 85 fixed to the elastic body 84.

[0051] The elastic body 84 is a cylindrical body made of rubber, the upper side of which protrudes beyond the outer periphery of the container part 83, and the lower side of which fits into the opening of the container part 83, and functions as a stopper against load in the compression direction. A flange part 86 is provided at the upper end of the container part 83, and the container part 83 containing the viscous fluid is sealed by the elastic body 84 by fixing the lower surface of the upper protruding part of the elastic body 84 to the upper surface of the flange part 86 using a bonding method such as baking adhesion. That is, the elastic body 84 functions as a lid that seals the viscous fluid contained in the container part 83. The flange part 86 is provided with a plurality of bolt insertion holes 87 through which fixing bolts can be inserted.

[0052] A stud 85 is held in the center of the upper part of the elastic body 84. The stud 85 is for connecting to the bottom plate of the cabin 10, and has a screw hole into which the threaded portion of a bolt screws into. The mount 82 and the cabin 10 are connected by fastening the bottom plate of the cabin 10 to the stud 85 with screws.

[0053] When vibrations are applied to the mount 82 configured as described above, the vibrations are damped by the viscous resistance of the viscous fluid contained in the container portion 83. Silicone oil can be used as the viscous fluid.

[0054] In the rear vibration isolation structure 99 in the cabin installation section 80, the mount 82c is directly supported by the support body 81c, and the mount 82d is directly supported by the support body 81d. That is, the mounts 82c and 82d are attached to the supports 81c and 81d, respectively, by inserting the container portion 83 into vibration isolation material mounting holes provided in the upper flat surfaces of the supports 81c and 81d, and fastening bolts (not shown) inserted into bolt insertion holes in the flange portion 86.

[0055] In the front vibration isolation structure 98 in the cabin installation portion 80, the mounts 82a, 82b are supported by the supports 81a, 81b via an intermediate plate material 91.

[0056] The intermediate plate 91 is made of a metal plate and has a flat plate portion 92 that is long in the left-right direction, and a protruding portion 93 for supporting the mount 82a on the left end side of the flat plate portion 92. As shown in Figures 8 to 11, the intermediate plate 91 is installed between the supports 81a and 81b. Note that Figure 11 shows a cross section taken along line AA in Figure 7.

[0057] The flat plate portion 92 has a step portion 94 that continuously connects the first plate portion 101 and the second plate portion 102, which are different in height. This step portion 94 functions as a height adjustment portion for providing a plate surface (the first plate portion 101 and the second plate portion 102) parallel to the surface of the base plate 71 of the swivel frame 7 on the intermediate plate material 91 supported by the supports 81a and 81b, which are different in height. The step portion 94 is formed as a slanted surface portion that slopes downward to the left in a portion from the center of the flat plate portion 92 toward the left side, and the first plate portion 101 is positioned at a lower height than the second plate portion 102. The step portion 94 may be a surface portion that is vertical to the horizontal first plate portion 101 and the second plate portion 102.

[0058] The protruding portion 93 is formed by bending a metal plate material, and has a generally inverted U-shape consisting of an upper flat plate portion 95 having an engagement surface with the flange portion 86 of the mount 82a and a pair of legs 97 (see Figs. 8 and 9). The protruding portion 93 has the lower end of the legs 97 fixed by welding onto the second plate portion 102 which is the right end side of the flat plate portion 92 which is elongated in the left-right direction. Note that the entire lower end of the legs 97 of the protruding portion 93 does not have to be fixed to the flat plate portion 92, and as shown in Fig. 9, a part of the legs 97 may protrude beyond the width of the flat plate portion 92. In addition, the lower end of the legs 97 of the protruding portion 93 may be bridged over a hole portion 96 for passing a cable or the like for supplying power to the electrical equipment of the driving section provided on the flat plate portion 92. Furthermore, the lower end of the legs 97 of the protruding portion 93, which is not directly connected to the flat plate portion 92, may be supported by a separate member such as a driving section support plate (not shown).

[0059] The protrusion 93 is configured such that the length of the leg 97 is equal to or longer than the vertical length of the container 83 of the mount 82a. The lower end of the container 83 is spaced from the upper surface of the second plate 102. The upper flat plate 95 of the protrusion 93 is provided with a bolt insertion hole that communicates with the vibration-proof material mounting hole and the bolt insertion hole 87 provided in the flange 86 of the mount 82a. The mount 82a is attached to the protrusion 93 by inserting the container 83 into the vibration-proof material mounting hole and fastening the flange 86 and the upper flat plate 95 of the protrusion 93 with a bolt and a nut. As a result, the container 83 of the mount 82a is disposed in the space between the flat plate 92 of the intermediate plate 91 and the protrusion 93.

[0060] The first plate portion 101, which is the left end side of the flat plate portion 92, is provided with a vibration-isolating material mounting hole 89 for mounting the mount 82b, and a bolt insertion hole communicating with a bolt insertion hole 87 provided in the flange portion 86 of the mount 82b. The mount 82b is attached to the intermediate plate material 91 by inserting the container portion 83 of the mount 82b into the vibration-isolating material mounting hole 89 and fastening the flange portion 86 and the first plate portion 101 with a bolt and a nut. The container portion 83 of the mount 82b is disposed in the space between the intermediate plate material 91 and the substrate 71. That is, the intermediate plate material 91, whose right end is supported by the support body 81a and whose left end is supported by the support body 81b, functions as a base for disposing the mount 82a at a higher position than the other mounts 82b, 82c, and 82d by the protruding portion 93.

[0061] A front frame plate 63a is disposed on the upper part of an intermediate plate material 91, the right end of which is supported by a mount 82a and the left end by a mount 82b. A protruding portion 65 is provided on one end (right end) of the front frame plate 63a, protruding upward from the plate surface in a convex shape. The protruding portion 65 has a rectangular box shape and is open at the bottom. A bolt insertion hole 67 is provided in the center of an upper flat surface portion 66 of the protruding portion 65. The mount 82a supported by the protruding portion 93 is accommodated in the internal space of the protruding portion 65, and a bolt 88 is inserted into the bolt insertion hole 67 of the upper flat surface portion 66 of the protruding portion 65 and screwed into a screw hole provided in a stud 85 of the mount 82a, thereby connecting the front frame plate 63a and the mount 82a.

[0062] When installing the cabin 10 on the revolving frame 7, the driver's section support plate on which the driver's seat, operating levers, etc. are mounted is connected to the bottom frame 61. At this time, the driver's section support plate is connected to the mounts 82b, 82c, and 82d via bolts. As a result, the bottom plate of the cabin 10, in which the bottom frame 61 and the driver's section support plate are integrated, is supported by the four mounts 82a, 82b, 82c, and 82d. Furthermore, by connecting the frame body 51 of the cabin 10 to the bottom plate, installation of the cabin 10 on the revolving frame 7 is completed.

[0063] Of the four mounts 82 in the cabin installation section 80, the mount 82a supporting the right front of the cabin 10 is positioned higher than the other three mounts 82b, 82c, and 82d, so that the container section 83 does not protrude into the space between the base plate 71 of the revolving frame 7 and the bottom plate of the cabin 10 at the right front of the cabin installation section 80. This makes it possible to provide a space in which the swing cylinder 38 can be placed below the mount 82a. The swing cylinder 38 is installed horizontally so as to pass under the mount 82a located from the center position of the rear end of the cabin installation section 80 to the right front, and the tip of the rod is connected to the swing cylinder connecting section 25 of the boom support bracket 31 located near the front center of the revolving frame 7. In this way, by devising the support structure of the mount 82a and the shape of the front frame plate 63a, the four mounts 82 can provide a vibration-proof effect for the cabin 10.

[0064] The four mounts 82 do not have to have the same specifications. The cabin 10 is provided with a driver's seat and a seat mount supporting the driver's seat at the lower rear side, and the cabin 10 has a shape in a side view with the upper rear end protruding rearward, so that the center of gravity of the cabin 10 is biased rearward. Therefore, for the mounts 82c and 82d supporting the rear of the cabin 10, for example, the thickness of the elastic body 84 in the upper part of the container part 83 may be thicker than that of the mounts 82a and 82b supporting the front of the cabin 10 in vibration isolation, in order to accommodate the rear load that is heavier than the front of the cabin 10. Also, in order to lower the height of the protruding part 65 of the front frame plate 63a, the length of the tube of the cylindrical container part 83 of the mount 82a may be shortened and the diameter of the tube may be increased to increase the surface area of ​​the elastic body 84, thereby balancing the load-bearing performance with the other three mounts 82b, 82c, and 82d.

[0065] Further, each of the mounts 82 is disposed at intervals in the front-rear and left-right directions of the area covered by the bottom plate of the cabin 10 on the base plate 71 of the revolving frame 7. The area covered by the bottom plate of the cabin 10 is also an area defined by the bottom frame 61. The four mounts 82 are disposed at positions corresponding to the four corners of the substantially rectangular bottom plate of the cabin 10, but the figure formed by virtually connecting the mounts 82 disposed at these four corners in the front-rear and left-right directions in a plan view does not need to be an exact rectangle, and it is acceptable for each side to be a quadrangle with different lengths. For example, each of the four mounts 82 can be disposed at a position where it can support the bottom plate from below in a certain width area defined by the outline of the bottom plate and the outline of a similar figure obtained by reducing the shape of the bottom plate from the outline by about 5 to 20% inward, taking into consideration the shape of the bottom plate of the cabin 10. It is sufficient that each of the mounts 82 is disposed at an appropriate interval from each other in a position where the forces supporting the load of the cabin 10 are approximately balanced. In addition, the four mounts 82 may be arranged, for example, such that, in a plan view, the center of gravity of the cabin 10 coincides with the intersection of the diagonals of a quadrangle whose vertices are the four mounts 82.

[0066] The excavation machine 1 according to the present embodiment having the above-mentioned configuration can be said to have the following configuration. That is, the excavation machine 1 is a work machine having a cabin 10, and is provided with a plurality of vibration-proofing materials (four mounts 82) that are arranged on a frame (swivel frame 7) on which the cabin is arranged and that provide vibration-proof support for the cabin 10, and a plate material (intermediate plate material 91) that is arranged between the frame (swivel frame 7) and the cabin 10 and that supports at least one of the plurality of vibration-proofing materials (mount 82a) and positions the vibration-proofing material higher than the other vibration-proofing materials. More specifically, the excavation machine 1 is provided with the four mounts 82 that are arranged on the revolving frame 7, which is the frame of the traveling vehicle body (machine body), and that provide vibration-proof support for the cabin 10, and the intermediate plate material 91 that is arranged between the base plate 71 of the revolving frame 7 and the bottom plate of the cabin 10 and that supports one mount 82a of the four mounts 82 and positions the mount 82a higher than the other mounts 82b, 82c, and 82d that are distributed at the same height in the horizontal direction.

[0067] According to the excavation work machine 1 according to the present embodiment having the above-mentioned configuration, the mount 82a out of the four mounts 82 is disposed at a higher position than the other mounts 82b, 82c, and 82d, so that a space can be provided under the mount 82a, and other members (swing cylinder 38) can be disposed in that space. That is, the space below the cabin 10 is more usable. In addition, since the space below the cabin 10 can be used more widely than in the past, the options for the size and type of members that can be disposed are expanded, and the degree of freedom in the design of the arrangement of parts and the like to be mounted on the revolving frame 7 is improved. Furthermore, in a conventional vibration-proof structure in which all of the multiple mounts are present in the space at a certain height between the bottom plate of the cabin 10 and the base plate 71 of the revolving frame 7, if a mount is located in a position that interferes with other members, the mount must be removed if the installation of the other members is prioritized, and there is a concern that the vibration-proof performance will be reduced. According to the excavation machine 1 of this embodiment, by shifting the position of at least one of the multiple mounts 82 upward, it is possible to achieve both the vibration-damping performance of the cabin 10 and utilization of the space below the cabin 10 without reducing the number of mounts 82.

[0068] Moreover, in the excavation work machine 1 according to this embodiment described above, the plate material (intermediate plate material 91) has a flat plate portion 92 and a protruding portion 93 protruding above the flat plate portion 92, and the vibration-proof material (mount 82a) is arranged spaced apart from the flat plate portion 92 via the protruding portion 93. That is, in the structure of the intermediate plate material 91, the intermediate plate material 91 is provided with the protruding portion 93 that protrudes upward, and the mount 82a arranged within the overhanging portion 65 is supported by the protruding portion 93, so that the mount 82a is arranged at a height spaced apart from the upper surface of the flat plate portion 92.

[0069] According to the excavator 1 of this embodiment having such a configuration, the mount 82 is supported by the protrusion 93, which allows for more flexible design of the vertical arrangement of the mount 82. As long as the height of the overhanging portion 65 of the front frame plate 63a is within an allowable range for the floor surface in front of the driver's seat of the cabin 10, it is also possible to support the mount 82 at a higher position.

[0070] Furthermore, in the excavation work machine 1 according to this embodiment described above, the plate material (intermediate plate material 91) has a mounting hole (vibration-proof material mounting hole 89) to which a vibration-proof material (mount 82b) different from the vibration-proof material (mount 82a) arranged via the protrusion 93 can be attached. By employing such an intermediate plate material 91, it becomes possible to easily arrange the at least two mounts 82a, 82b at different heights.

[0071] Furthermore, in the excavation work machine 1 according to this embodiment described above, the plate material (intermediate plate material 91) has a step portion 94 between the protrusion 93 in the flat plate portion 92 and the mounting hole (vibration-proof material mounting hole 89). In other words, when mounts 82a and 82b are arranged at different heights, the arrangement height can also be adjusted by the step portion 94 provided on the intermediate plate material 91.

[0072] In the excavator 1 according to the present embodiment described above, in the front vibration isolation structure 98 supporting the front of the cabin 10, an intermediate plate material 91 is installed on top of the supports 81a and 81b, and the intermediate plate material 91 is interposed between the mount 82a and the support 81a, so that the mount 82a is supported by the intermediate plate material 91. By employing such an intermediate plate material 91, it becomes possible to change the vertical arrangement of some of the multiple mounts 82 without changing the shape of the support that has been conventionally employed, compared to when the mount 82 is supported only by the support 81.

[0073] In addition, in the excavation machine 1 of this embodiment described above, the bottom plate (bottom frame 61, front frame plate 63a) of the cabin 10 has a protruding portion 65 that protrudes upward in a convex manner, and the protrusion 93 is arranged below the protruding portion 65.

[0074] It can also be said that the excavator 1 has the following configuration: That is, the vibration isolation structure (front vibration isolation structure 98, rear vibration isolation structure 99) supporting the cabin 10 arranged on the revolving frame 7 rotatably provided above the lower traveling body 2A has a plurality of supports fixed to the revolving frame 7 and a plurality of vibration isolation materials (four mounts 82) supported by the plurality of supports, and at least one of the plurality of vibration isolation materials (four mounts 82) (mount 82a) is arranged in the space within the protruding portion 65 where a part of the bottom plate (front frame plate 63a) of the cabin 10 protrudes upward in a convex shape.

[0075] In this way, since the bottom plate of the cabin 10 is provided with the protruding portion 65 and the mount 82 is housed therein, it is only necessary to increase the height of a portion of the upper surface of the floor where the driver's seat is located, and the overall height of the floor can be kept low. This makes it possible to prevent the installation height of the cabin 10 from increasing.

[0076] Furthermore, in the excavator 1 according to this embodiment described above, the vibration-proof material (mount 82) is a liquid-filled mount having a cylindrical container portion 83 that contains a viscous fluid, a flange portion 86 that protrudes outward from the open end of the container portion 83, and an elastic body 84 that covers the opening of the container portion 83. This allows the mount 82 to be easily attached to the support body 81 and intermediate plate material 91 via the flange portion 86.

[0077] Here, a modified example of the front vibration isolation structure 98 of the cabin according to this embodiment will be further described with reference to Fig. 12 to Fig. 15. Note that the same members as those in the configuration of the front vibration isolation structure 98 shown in Fig. 8 to Fig. 11 are given the same reference numerals, and detailed description thereof will be omitted.

[0078] 12, a flat intermediate plate 191 with no steps in the up-down direction is supported by a support 181a having the same height as the front left support 81b. A protrusion 193 provided on the right end side of the intermediate plate 191 is configured to be higher than the protrusion 93 by the amount that the height of the support 181a is lower than the above-mentioned support 81a.

[0079] In this way, in the front vibration isolation structure 98, by making the length of the leg 197 of the protrusion 193 longer than the leg 97 of the protrusion 93, it is possible to adjust the height positions of the mounts 82a and 82b relative to the substrate 71. In other words, the mounts 82a and 82b can support the front frame plate 63a parallel to the substrate 71. In this way, in the front vibration isolation structure 98, even when the left and right sides of the intermediate plate material 191 not provided with a step portion are supported by the supports 181a and 82b of the same height, it is possible to horizontally support the bottom plate of the cabin 10 by the multiple mounts 82 by adjusting the height of the leg 197 of the protrusion 193 and the protruding portion 65 and the protruding height of the front frame plate 63a.

[0080] In the modified example shown in FIG. 12, a vibration-proof material mounting hole is provided on the right end side of the intermediate plate 191 to mount the mount 82b at a position lower than the mount 82a. In the modified example shown in FIG. 13, instead of the vibration-proof material mounting hole, a protrusion 193 is provided on the upper part of the intermediate plate 192. In this way, in the front support structure of the cabin 10, when the mounts 82b and 82a are disposed above the intermediate plate 192, the shape of the front frame plate 63a connected to each of the mounts 82a and 82b is also changed accordingly. The shape of the front frame plate 63a may be a shape in which a tunnel-shaped protrusion 165 is formed across the left and right direction of the cabin 10, as shown in FIG. 13. In this case, the protrusion 165 provides a step across the left and right on the floor surface in front of the driver's seat. In addition, as another shape of the front frame plate 63a, a shape in which the same shape of protrusions 65 are provided at positions corresponding to the arrangement of the protrusions 193 may be used.

[0081] In the configuration of the modified example shown in FIG. 14, a support 81e is further provided between the supports 81a and 81b. The shape of this support 81e is the same as that of the support 81a, but may be another shape as long as it has the same height as the support 81a and does not interfere with the swing cylinder 38. The support 81a and the support 81e support an intermediate plate 291 having a shorter length in the left-right direction than the intermediate plate 91 described above. Therefore, a support part 292 having a vibration-proof material mounting hole is provided on the upper part of the support 81b, and the mount 82b is supported at the same height as the mounts 82c and 82d supported by the supports 81c and 81d. When such an intermediate plate 291 is adopted, the support 81e is added, and the support 81b is changed to a shape capable of supporting the mount 82.

[0082] In the configuration of the modified example shown in FIG. 15, in order to lower the height of the overhanging portion 365 in the front frame plate 63a, a protrusion 393 having a leg portion 397 lower than the protrusion 93 and an intermediate plate member 391 having a hole through which the container portion 83 of the mount 82 can be inserted in the flat plate portion 92 directly below the protrusion 93 are adopted, and the mount 82a is supported so that a part of the container portion 83 is lower than the flat plate portion 92. If a space is secured below the mount 82a in which other members can be placed, the entire mount 82a does not need to be above the intermediate plate member 391, and it is also possible to lower the height of the overhanging portion 365 on the floor surface in front of the driver's seat of the cabin 10. In other words, it is sufficient that at least a part of the mount 82a can be placed so as to protrude above the bottom plate of the cabin 10.

[0083] The above-mentioned embodiment is an example of the present invention, and the working machine according to the present invention is not limited to the above-mentioned embodiment. Therefore, even if it is an embodiment other than the above-mentioned, various modifications are possible according to the design, etc., as long as they do not deviate from the technical idea of ​​the present invention. Furthermore, the effects described in this disclosure are merely examples and are not limited, and other effects may be obtained.

[0084] In the embodiment of the present invention described above, the heights of the supports 81a and 81b are different. On the other hand, as shown in the modified example, the heights of the supports 81a and 81b supporting the intermediate plate material 91 may be the same. In other words, the shape of the intermediate plate material 91, 191, 192, 291 and the structure supporting it are configured to horizontally support the bottom plate of the cabin 10 with a plurality of mounts, and are determined in consideration of the height of the protruding portion 93, the height of the overhanging portion 65 of the front frame plate 63a, and the like.

[0085] In one embodiment of the present invention, the intermediate plate 91 is supported by supports 81a and 81b having different heights, and a step 94 is provided midway in the flat plate portion of the intermediate plate 91 to adjust the support height of the mount by the supports 81a and 81b having different heights, but the present invention is not limited to this. The height of the supports 81a and 81b supporting the intermediate plate 91 can be determined in consideration of the height from the flange portion 86 of the mount 82 to the upper end of the elastic body 84, the height of the protruding portion 93 of the intermediate plate 91, and the height of the overhanging portion 65 of the front frame plate 63a so that the front frame plate 63a is parallel to the substrate 71 of the swivel frame 7. For example, in the front vibration isolation structure 98, the left and right sides of the intermediate plate members 191 and 192 not provided with a step portion are supported by supports of the same height, and the height of the protruding portion 93 and the overhanging height of the overhanging portion 65 of the front frame plate 63a may be adjusted so that the front frame plate 63a is parallel to the substrate 71.

[0086] In the embodiment of the present invention described above, the intermediate plate 91 is interposed between the protrusion 93 supporting the mount 82a and the support 81a, but the shape of the support 81a may be modified so that the protrusion 93 is directly supported by the support. Furthermore, in the embodiment described above, the protrusion 93 supporting the mount 82a and the support 81a are separate members, but the mount 82a may be supported by a support having a height that serves both the protrusion 93 and the support 81a without the intermediate plate 91. Furthermore, other members such as spacers may be added to adjust the height position that supports each mount 82. In addition, the mount 82 may be directly disposed on the upper surface of the intermediate plate 91 without using the protrusion 93.

[0087] In addition, in the embodiment of the present invention described above, the bottom plate of the cabin 10 is supported at four points by four mounts 82, but this is not limited to the above. Three-point support by three mounts 82 is also possible, or further mounts may be added to provide vibration-proof support at a total of five points, two points at the front and three points at the rear, or six points, two points at the front, two points in the middle, and two points at the rear.

[0088] In the embodiment of the present invention described above, an example has been described in which the support height of the mount 82a arranged at the right front of the cabin 10 is made higher than the other three mounts 82b, 82c, and 83d in the front vibration isolation structure 98 of the cabin 10 in order to secure the arrangement space for the swing cylinder 38, but this is not limiting. Taking into consideration the size, shape, and maintenance workability of a member to be arranged in the space between the bottom plate of the cabin 10 and the base plate 71 of the revolving frame 7, the support structure of the cabin 10 may be changed so that the support height of any one of the mounts 82b, 82c, and 83d is made higher.

[0089] In the embodiment of the present invention described above, a liquid-filled mount is used as the vibration-isolating material, but this is not limited to this. For example, a rubber mount made of rubber of a predetermined thickness and a metal frame may be used. [Explanation of symbols]

[0090] 1 Excavation machine (work machine) 2A Undercarriage 2B Upper rotating body 3. Drilling Rig 4 Earth removal equipment 5 Running part 6 Aircraft Frame 7 Swivel Frame 9 Counterweight 10 Cabin 38 Swing Cylinder 61 Bottom Frame 63a Front frame plate 65 Overhang 72 Left vertical rib (vertical board) 80 Cabin installation area 81 Support 82 Mount (vibration-proof material) 82a Mount (1st Mount) 82b Mount (2nd Mount) 82c Mount (3rd Mount) 82d Mount (4th Mount) 83 Container section 84 Elastic Body 86 Flange part 89 Anti-vibration material mounting hole 91 Intermediate plate material 92 Flat plate part 93 Protrusion 94 Step 98 Front vibration prevention structure 99 Rear vibration-proof structure

Claims

1. A cabin is disposed on one side of a machine body frame in a left-right direction, and an excavation device is supported in front of the machine body frame so as to be rotated left and right by an operation of a swing cylinder, A work machine, wherein the swing cylinder is disposed below the cabin.

2. a first mount that supports the other side of the cabin in the left-right direction above the swing cylinder; 2. The work machine of claim 1.

3. a second mount supporting one side of the cabin in the left-right direction and disposed lower than the first mount; 3. A work machine according to claim 2.

4. The second mount is disposed at a position facing the swing cylinder.

4. A work machine according to claim 3.

5. a third mount and a fourth mount that support the cabin rearward of the first mount and the second mount; The swing cylinder is disposed between the third mount and the fourth mount.

5. A work machine according to claim 4.

6. The third mount and the fourth mount are disposed below the first mount.

6. A work machine according to claim 5.

7. The aircraft frame includes a vertical plate extending in a front-rear direction adjacent to the swing cylinder, the first mount is disposed on one side of the vertical plate in the left-right direction, The fourth mount is disposed on the other side in the left-right direction with respect to the vertical plate. A work machine according to claim 5 or claim 6.

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