Work machine

Abstract

To provide a work machine capable of mounting a driver seat protection unit without compromising the ease of assembly and maintenance of the members placed on a swivel base.SOLUTION: A work machine includes: a machine body; a running unit that supports the chassis so as to run; and a working unit attached to the chassis. The chassis includes: a swivel base including a base plate, which is supported by the running unit and is rotatable about an axis extending vertically as a rotation axis, and a unit support, which is attached to the base plate and supports the working unit; a driver seat disposed on the base plate; and a driver seat protection unit that protects the driver seat. A support member that supports the driver seat protection unit is removably attached to the unit support.SELECTED DRAWING: Figure 12

Description

Technical Field

[0001] The present invention relates to a working machine in which a driver's seat protection device for protecting a driver's seat is supported by a swivel base that can swivel.

Background Art

[0002] Conventionally, there has been a device including a swivel base that can swivel about a vertical axis as a swivel center, a driver's seat disposed on the swivel base, and a driver's seat protection device for protecting the driver's seat. For example, in Patent Document 1, a cabin is vibration-isolation supported via a mount member on a mount attachment portion provided on a swivel base.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, since various members are arranged on the swivel base, the mounting position of the support member that supports the driver's seat protection device is restricted, and the size and shape of the driver's seat protection device may be restricted. Alternatively, if the mounting position of the support member is determined with priority given to the size and shape of the driver's seat protection device, it may become difficult to access the members arranged below the support member, resulting in a decrease in assemblability and maintainability.

[0005] Therefore, an object of the present invention is to enable mounting of a driver's seat protection device without reducing the assemblability and maintainability of the members arranged on the swivel base.

Means for Solving the Problems

[0006] The working machine of the present invention includes a machine body, a traveling device that supports the machine body so as to be capable of traveling, and a working device attached to the machine body. The machine body includes a base plate supported by the traveling device, the base plate being rotatable about an axis extending in the vertical direction as a rotation center, a device support body attached to the base plate for supporting the working device, a driver's seat disposed on the base plate, and a driver's seat protection device for protecting the driver's seat. A support member for supporting the driver's seat protection device is detachably attached to the device support body.

Effect of the Invention

[0007] According to the present invention, the driver's seat protection device can be mounted without reducing the assemblability and maintainability of the members arranged on the swivel base.

Brief Description of the Drawings

[0008]

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Mode for Carrying Out the Invention

[0009] Hereinafter, the first embodiment of the present invention will be described with appropriate reference to the drawings.

[0010] As shown in FIGS. 1 and 2, the work machine 1 includes a traveling device 2 capable of moving forward and backward, a working device 3 that performs a predetermined work, and a machine body 5 that is supported by the traveling device 2 and supports the working device 3. In the following description, the direction in which the traveling device 2 travels straight (the forward and backward directions) is referred to as the front-rear direction, and the direction orthogonal to the front-rear direction is referred to as the lateral direction.

[0011] Furthermore, the work machine 1 includes a hydraulic system 6 for operating the traveling device 2 and the work device 3, a prime mover 4 for driving a hydraulic pump 60 included in the hydraulic system 6, and an operator's seat 50. In the present embodiment, the operator's seat 50 and the prime mover 4 are provided on the machine body 5. As shown in FIG. 3, the hydraulic system 6 includes a hydraulic oil tank 61 for storing hydraulic oil, a hydraulic pump 60 for discharging hydraulic oil toward an actuator, hydraulic cylinders (boom cylinder 33a, arm cylinder 34a, tool cylinder 35a, swing cylinder 36a, lift cylinder 32b), and hydraulic motors (swing motor 532, traveling motor 20) and other actuators, a valve device for controlling the hydraulic oil supplied to each actuator 33a, 34a, 35a, 36a, 32b, 532, 20, and piping for connecting these members. In FIG. 3, the valve device is omitted and the piping is schematically shown.

[0012] Returning to FIGS. 1 and 2, the traveling devices 2 are arranged on both lateral sides of the machine body 5. That is, the work machine 1 includes a pair of traveling devices 2, 2. In the present embodiment, a crawler-type traveling device is adopted for each of the pair of traveling devices 2, 2. The traveling device 2 includes a traveling motor 20 as a drive source (see FIG. 1). In the present embodiment, the traveling motor 20 is a hydraulic motor that receives the supply of hydraulic oil from the hydraulic system 6.

[0013] The work machine 1 according to the present embodiment is a backhoe, and as the work device 3, it includes a shovel device (excavating device) 3a and a dozer device 3b.

[0014] As shown in FIG. 1, the shovel device 3a includes a swing bracket 300a swingably connected to the machine body 5 about a vertical axis (connection pin 303a), a boom 301a having a base end portion swingably connected to the swing bracket 300a about a horizontal axis, an arm 302a having one end portion swingably connected to the tip end portion of the boom 301a about a horizontal axis, and a work tool 32a (bucket) having the other end portion swingably connected to the arm 302a about a horizontal axis.

[0015] The dozer device 3b is connected to the machine body 5 and extends forward in the front-rear direction from the machine body 5. The dozer device 3b is connected to the machine body 5 (travel base 51) via a shaft extending in the lateral direction, and includes a lifting arm 31b that can swing vertically about the shaft, and a blade 30b that is connected to the tip of the lifting arm 31b and has a surface facing the traveling direction (forward direction) of the traveling device 2.

[0016] The excavator device 3a includes a boom cylinder 33a that tilts the boom 301a, an arm cylinder 34a that tilts the arm 302a with respect to the boom 301a, a working tool cylinder 35a that tilts the working tool 32a with respect to the arm 302a, and a swing cylinder 36a (see FIG. 9) that swings the swing bracket 300a about the connecting pin 303a (shaft). The dozer device 3b also includes a lifting cylinder 32b that swings the lifting arm 31b. These cylinders 33a, 34a, 35a, 36a, 32b are driven by hydraulic oil supplied from the hydraulic system 6.

[0017] As shown in FIG. 4, the prime mover 4 is disposed on the swing base 52 behind the driver's cab DR (driver's seat 50). In this embodiment, a diesel engine is adopted as the prime mover 4, but it is not limited thereto. For example, a gasoline engine, an LPG engine, a hydrogen engine, etc. may also be used. Further, the prime mover 4 is not limited to an internal combustion engine, and may be an electric motor.

[0018] As shown in FIG. 5, the machine body 5 includes a travel base 51 connected to a pair of left and right traveling devices 2, 2, a swing base 52 disposed above the travel base 51, an annular swing bearing 53 interposed between the travel base 51 and the swing base 52, and a driver's seat protection device 54 disposed on the swing base 52 and defining a driver's cab (riding space) DR.

[0019] Before describing the slewing base 52, the slewing bearing 53 will be described. The slewing bearing 53 has an inner ring 530 and an outer ring 531 that is concentric with and rotatable relative to the inner ring 530. A plurality of engaging teeth (annular gears) that can mesh with a pinion attached to the output shaft of the slewing motor 532 are provided side by side in the circumferential direction on the inner circumference of the inner ring 530 or the outer circumference of the outer ring 531.

[0020] Either the inner ring 530 or the outer ring 531 is connected to the traveling base 51, and the other of the inner ring 530 or the outer ring 531 is connected to the slewing base 52. Thereby, the slewing bearing 53 relatively rotates the inner ring 530 and the outer ring 531 with the axis extending in the vertical direction as the slewing center CL by driving the slewing motor 532, and slews (rotates) the slewing base 52 with respect to the traveling device 2 (traveling base 51).

[0021] In the present embodiment, the inner ring 530 is connected to the traveling base 51, and the outer ring 531 is connected to the slewing base 52 (base plate 55) (see FIGS. 6 to 8). Further, in the present embodiment, a plurality of engaging teeth (annular gears) are provided on the inner circumference of the inner ring 530. Thereby, in the present embodiment, the slewing base 52 connected to the outer ring 531 rotates (slews) by driving the slewing motor 532. In the present embodiment, the slewing motor 532 is a hydraulic motor that receives the supply of hydraulic oil from the hydraulic system 6, similar to the traveling motor 20.

[0022] A plurality of screw holes S1, S2 into which fixing male screw members Bv (see FIG. 7) are screwed are arranged at intervals in the circumferential direction on the inner ring 530 and the outer ring 531. Specifically, a plurality of screw holes S1... for screwing a male screw member for connecting the slewing bearing 53 to the traveling base 51 are formed at intervals in the circumferential direction on the downward-facing surface of the inner ring 530. On the other hand, a plurality of screw holes S2 for screwing the male screw member Bv for connecting the slewing bearing 53 to the slewing base 52 are formed at intervals in the circumferential direction on the upward-facing surface of the outer ring 531.

[0023] In the following description, there may be references to machined (planar machined) parts. These machining operations are premised on being performed after machining operations with thermal effects such as welding (machining that causes distortion due to heat) in order to ensure machining accuracy.

[0024] The slewing base 52 has a base plate 55 that supports the operator protection device 54 and the prime mover 4, and a device support (support bracket) 56 that is attached to the base plate 55 and supports the work device 3 (3a).

[0025] The base plate 55 is a metal plate and has a placement surface on its lower surface that is placed on the slewing bearing 53 (outer ring 531). The placement surface is formed in a plane, and as shown in FIGS. 6 to 8, a plurality of through holes H2... through which a plurality of male screw members Bv for fixing to the slewing bearing 53 (outer ring 531) are inserted are vertically penetrating. These plurality of through holes H2... coincide with the arrangement of a plurality of screw holes S2... (see FIG. 5) provided in the slewing bearing 53 (outer ring 531).

[0026] Specifically, in the base plate 55, the plurality of through holes H2 are arranged on a virtual circle that is concentric or substantially concentric with the rotation center (slewing center CL) of the slewing bearing 53 within an annular region CA that projects vertically and overlaps with the slewing bearing 53 (outer ring 531 in this embodiment), and are arranged at intervals in the circumferential direction of the virtual circle. In the work machine 1 of this embodiment, when the base plate 55 rotates (turns) about the slewing center CL, the position of the work device 3 changes (the front-rear direction of the base plate 55 turns about the slewing center CL and faces laterally or reverses front to back). However, in order to set the posture in which the work device 3 is arranged on the front side in the forward direction of the traveling device 2 (traveling base 51) as the standard posture, the description here is based on the standard posture.

[0027] As shown in FIG. 6, the center (centroid) in the plan view of the base plate 55 is shifted to the rear side in the front-rear direction with respect to the slewing center CL (rotation center by the slewing bearing 53).

[0028] The base plate 55 is provided with an opening for arranging a hole for inserting the output shaft of the swing motor 532, a swivel joint (not shown) for connecting the hydraulic system on the traveling device 2 side and the hydraulic system on the machine body 5 side, and the like.

[0029] Among the entire area A of the base plate 55 according to the present embodiment (the entire area A viewed from above), the area on the front side in the front-rear direction and on one side in the lateral direction is set as an area (hereinafter referred to as the first arrangement area) A1 for arranging the driver's seat protection device 54, the area on the rear side in the front-rear direction is set as an area (hereinafter referred to as the second arrangement area) A2 for arranging the prime mover 4, and the area on the front side in the front-rear direction and on the other side in the lateral direction is set as an area (hereinafter referred to as the third arrangement area) A3 for arranging a fuel tank 40 for storing fuel of the internal combustion engine (prime mover) 4, a hydraulic oil tank 61 for storing hydraulic oil of the hydraulic system 6, and the like.

[0030] The device support 56 is arranged so as to projectively avoid at least the male screw member Bv in the annular region CA in the vertical direction. The device support 56 is connected to the base plate 55 by welding.

[0031] As shown in FIGS. 7 and 8, the device support 56 is arranged on the upper surface side of the base plate 55, and includes a main body portion 560 arranged at the front end portion in the front-rear direction of the base plate 55, a pair of leg portions 561, 561 extending rearward in the front-rear direction from the main body portion 560, and a device connection portion 562 to which the working device 3 is connected, the device connection portion 562 extending forward in the front-rear direction from the main body portion 560.

[0032] An installation surface 564 for installing a support member (second support member) 71 for supporting the frame 59 of the driver's seat protection device 54 is provided in the region between the leg portions 561 on the upper surface of the main body portion 560. The installation surface 564 is a plane facing upward, and flatness is ensured by machining.

[0033] On the installation surface 564, a screw hole S3 for screwing in a male screw member B, which is a screw member for fixing the support member 71, is drilled downward. In the present embodiment, a pair of screw holes S3, S3 are drilled in the installation surface 564 at intervals in the lateral direction. Between the pair of screw holes S3, S3 on the installation surface 564, the rear edge in the front-rear direction is recessed toward the front side in the front-rear direction. More specifically, the central portion between the pair of screw holes S3, S3 on the installation surface 564 is partially recessed from the rear side to the front side in the front-rear direction (see FIGS. 6 and 7). Note that the support member 71 will be described in detail in the description of the driver's seat protection device 54 that defines the driver's cab DR.

[0034] The pair of leg portions 561, 561 are arranged at intervals in the lateral direction. In the present embodiment, the pair of leg portions 561, 561 are arranged such that the distance between them in the lateral direction increases as they go toward the rear side in the front-rear direction. The pair of leg portions 561, 561 are arranged so as to avoid a plurality of through holes (through holes through which a male screw member Bv for fixing the slewing bearing 53 is inserted) H2 provided in the base plate 55.

[0035] The lower ends of the main body portion 560 and the pair of leg portions 561, 561 are welded to the base plate 55. Thereby, in the slewing base 52 according to the present embodiment, the base plate 55 and the device support 56 are integrated. Although not shown in FIGS. 6 to 8 and the like for the sake of explanation, as shown in FIG. 11, on the upper surface of the base plate 55, a pair of vertical ribs 565, 565 extending rearward in the front-rear direction are erected from each of the pair of leg portions 561, 561. Each of the pair of vertical ribs 565, 565 is a plate member standing on the upper surface of the base plate 55, and enhances the bending strength of the base plate 55.

[0036] As shown in FIG. 7, the device connection part 562 includes a pair of extension parts 563, 563 that each extend forward from the main body part 560 and are arranged at intervals in the vertical direction. Through holes H3 for inserting a connection pin 303a for connecting the working device 3 are vertically formed through the tip parts of the pair of extension parts 563, 563. The through holes H3 of the pair of extension parts 563, 563 are concentric, and the connection pin 303a can be inserted concentrically into each of them.

[0037] In the device support 56, the main body part 560, the pair of leg parts 561, 561, and the device connection part 562 are integrally formed. The device support 56 of the present embodiment is a casting (cast product). That is, the device support 56 is made of cast iron. Note that the device support 56 is not limited to being a casting, and for example, it may be manufactured by combining a plurality of metal members (appropriately welding them) or may be a sheet metal product formed by processing a plate material.

[0038] As shown in FIGS. 1, 2, and 4, the lower part of the driver's cab DR and the driver's seat 50 are arranged on the front side of the prime mover 4 in the front-rear direction.

[0039] As shown in FIG. 4, the driver's cab DR is defined by a step 57 that constitutes a floor (floor plate) and on which the driver's seat 50 (seat) is installed, and a driver's seat protection device 54 that covers the driver's seat 50 on the step 57.

[0040] The step 57 is a component equipped on the working machine 1. In the present embodiment, the step 57 is a metal plate and is arranged above the slewing base 52. That is, the step 57 is arranged at an interval in the vertical direction with respect to the slewing base 52. Also, as shown in FIG. 9, the working machine 1 is equipped with, as components, in addition to the step 57, a fuel tank 40, a hydraulic oil tank 61, etc. The fuel tank 40 and the hydraulic oil tank 61 are arranged at an interval in the vertical direction with respect to the slewing base 52.

[0041] As shown in FIG. 10, the work machine 1 includes support members 70, 71, 72, 73, 74 that support equipment components such as the step 57, the fuel tank 40, and the hydraulic oil tank 61 at intervals with respect to the swing base 52 (base plate 55). Specifically, the work machine 1 includes a first support member 70 fixed to the swing base 52 by welding, a second support member 71 that is detachable from the device support 56, and a third support member 72 that is detachably attached to the base plate 55.

[0042] Further, the work machine 1 includes a fourth support member 73 and a fifth support member 74 that are detachably attached to the base plate 55 as support members for supporting the fuel tank 40 and the hydraulic oil tank 61. Furthermore, as shown in FIGS. 10 and 11, the work machine 1 includes rear end support members 715, 715 that partially support a support frame 10 described later.

[0043] The first support member 70 extends in the vertical direction, and one end (lower end) is welded to the base plate 55 of the swing base 52. The first support member 70 is a leg welded to the base plate 55 and has a leg standing on the upper surface of the base plate 55. In the present embodiment, the first support member 70 is arranged at a plurality of locations (three locations) on the base plate 55 so as to support three of the four corner portions (four corners) of the step 57 having a rectangular shape in plan view, namely, the left front corner portion, the left rear corner portion, and the right rear corner portion. In the present embodiment, the first support member 70 that supports the left front corner portion of the step 57 has a single leg, but the legs of the two first support members 70 that support the left rear corner portion and the right rear corner portion of the step 57 are formed in a plate shape extending in the lateral direction and are common legs.

[0044] The first support member 70 forms an installation surface 700 for arranging the step 57 above the legs. That is, each of the plurality of first support members 70 has an installation surface 700 for arranging the step 57 at the other end (upper end). A screw hole S4 for screwing a male screw member in the vertical direction is provided in the installation surface 700 of each first support member 70. Among the plurality of first support members 70, the first support member 70 that supports the left front corner of the step 57 has, in addition to the screw hole S4 described above, a screw hole S5 for fixing the driver's seat protection device 54 drilled vertically. This screw hole S5 is provided corresponding to the arrangement of the through hole H12 of the front fixing portion 592 described later. On the other hand, the two first support members 70 that support the left rear corner and the right rear corner of the step 57 are provided with screw holes for screwing a screw member for fixing the support frame 10 in addition to the screw hole S4 described above.

[0045] As shown in FIGS. 7 and 12, the second support member 71 has a base portion 710 detachably attached on the installation surface 564 of the device support 56, and a support main body portion 711 connected to the base portion 710. The support main body portion 711 has a protection device support portion 711a capable of supporting the driver's seat protection device 54, and a step support portion 711b for supporting the step 57.

[0046] The base portion 710 is arranged on the installation surface 564 of the device support 56 as described above. The surface facing the lower surface (lower side) of the base portion 710 is a flat surface, and flatness is ensured by machining. In the present embodiment, the base portion 710 protrudes rearward in the front-rear direction from the installation surface 564 of the device support 56 (the edge (boundary) on the rear side of the installation surface 564) in a state of being arranged on the installation surface 564 of the device support 56.

[0047] A pair of through holes H4, H4 for inserting a male screw member B for fixing the second support member 71 to the device support 56 are drilled vertically at positions communicating with a pair of screw holes S3, S3 provided in the installation surface 564 of the device support 56.

[0048] The support main body portion 711 has a length in the front-rear direction longer than the length of the base portion 710 in the same direction. One end side of the support main body portion 711 is fixed to the upper surface of the base portion 710 by welding in a state where it is overlapped with the upper surface of the base portion 710, and the other end side of the support main body portion 711 extends (protrudes) to the rear side in the front-rear direction with respect to the base portion 710. The support main body portion 711 is disposed in a region avoiding the through-hole H4 on the upper surface of the base portion 710 and is connected to the base portion 710. In the present embodiment, one end side of the support main body portion 711 is fixed between a pair of through-holes H4, H4 arranged at intervals in the lateral direction in the base portion 710.

[0049] The support main body portion 711 is formed of a single plate material. A protection device support portion 711a is formed in a substantially square shape in plan view at the front portion of the support main body portion 711, and a step support portion 711b is formed at the rear portion of the support main body portion 711 so as to protrude rearward from the protection device support portion 711a. The protection device support portion 711a overlaps the upper surface of the base portion 710 in a state where the front end portion protrudes slightly forward from the front end portion of the base portion 710. The protection device support portion 711a is fixed to the base portion 710 while avoiding a pair of through-holes H4, H4 (between the pair of through-holes H4, H4). In the present embodiment, the base portion 710 disposed on the installation surface 564 of the device support 56 protrudes to the rear side in the front-rear direction from the installation surface 564 of the device support 56, and the protection device support portion 711a protrudes to the rear side in the front-rear direction from the base portion 710.

[0050] As shown in FIG. 8, the protection device support portion 711a projects and overlaps (overlaps in plan view) the annular region CA in the vertical direction with a space from the base plate 55 in a state where the base portion 710 is fixed on the installation surface 564 of the device support 56. That is, the portion of the protection device support portion 711a protruding rearward from the installation surface 564 faces the lower base plate 55 and projects and overlaps in the vertical direction with the region (annular region CA) where the male screw member Bv for fixing the base plate 55 to the swing bearing 53 exists.

[0051] Accordingly, in the present embodiment, the protection device support portion 711a overlaps the entire width of the annular region CA (an endless annular belt-shaped region). For this reason, when the second support member 71 is non-detachable, it becomes difficult to operate the male screw member Bv below the protection device support portion 711a using tools such as a wrench. On the other hand, in the present embodiment, by removing the male screw member B, the second support member 71 can be removed, so that tools can access the male screw member Bv from above, and appropriate operations can be performed. Thereby, the workability of operations such as attaching and detaching the base plate 55 to and from the slewing bearing 53 and torque management work of the male screw member Bv can be improved.

[0052] Also, in the present embodiment, since the protection device support portion 711a can be detachably attached to the installation surface 564 of the device support body 56, the degree of freedom in the installation position of the protection device support portion 711a can be improved even when the slewing bearing 53 (outer ring 531) is disposed in the vicinity of the device support body 56. Thereby, the comfort of the driver can be improved by increasing the size of the driver's seat protection device 54 without interfering with the work device 3. For example, even when having a guard member 58 in front of the front window 541 as shown in FIG. 1, the driver's seat protection device 54 can be installed at a position where interference between the work device 3 and the guard member 58 can be prevented and the size of the driver's seat protection device 54 can be maximized.

[0053] A screw hole S6 for screwing a male screw member (screw member) 82 for fixing the driver's seat protection device 54 (frame 59) in the vertical direction is provided in a portion protruding rearward from the installation surface 564 of the device support body 56 in the protection device support portion 711a (see FIG. 18). The protection device support portion 711a of the present embodiment is provided with a screw hole S6 for screwing the male screw member 82 in a portion protruding rearward from an edge on the rear side in the front-rear direction of the installation surface 564 of the device support body 56, which is an edge that is partially recessed from the rear to the front between a pair of screw holes S3, S3 (see FIG. 18).

[0054] The step support portion 711b protrudes rearward in the front-rear direction from the protection device support portion 711a. As shown in FIG. 12, the upper surface of the step support portion 711b is an installation surface 712 for installing the step 57. In the present embodiment, the upper surface of the protection device support portion 711a and the upper surface of the step support portion 711b are continuous common planes, and the entire upper surface of the support main body portion 711 (the upper surface of the protection device support portion 711a and the step support portion 711b) constitutes the installation surface 712 of the step 57. The upper surfaces of the protection device support portion 711a and the step support portion 711b (installation surface 712) are ensured to have flatness by machining.

[0055] As shown in FIG. 13, screw holes S7 for screwing in male screw members B1 for fixing the step 57 are formed vertically in the step support portion 711b (installation surface 712). In the present embodiment, for fixing the step 57 to the step support portion 711b, after fitting a cylindrical collar 571 onto the male screw member B1, the male screw member B1 and the collar 571 are inserted through the through hole of the step 57. Along with this, a counterbore concentric or substantially concentric with the screw hole S7 is provided on the upper surface of the step support portion 711b, and the collar 571 is received at the bottom surface of the counterbore. Thereby, even when a load, vibration, etc. of the working device 3 (excavator device 3a) act on the device support 56, loosening of the male screw member B1 for fixing the step 57 is prevented (suppressed).

[0056] Since the step support portion 711b protrudes rearward from the protection device support portion 711a, as shown in FIG. 8, it vertically projects and overlaps the base plate 55 beyond the region (annular region CA) where the male screw member Bv for fixing the base plate 55 to the slewing bearing 53 exists.

[0057] As shown in FIG. 12, the male screw member B for fixing the second support member 71 has a head portion and a screw portion with a smaller diameter than the head portion. The screw portion is inserted into the through-hole H4 of the base portion 710 and screwed into the screw hole S3 of the installation surface 564. The vertical thickness of the support main body portion 711 is set to be thicker than the vertical length (thickness) of the head portion of the male screw member B. Thereby, when the step 57 is disposed on the step support portion 711b, it is prevented that the step 57 interferes with the head portion of the male screw member B (the step 57 floats up).

[0058] As shown in FIG. 14, the third support member (support member) 72 is attached to the base plate 55 via the screw member B2. Specifically, the third support member (support member) 72 includes a base 720 as a fixing portion fixed to the base plate 55 via the screw member B2, and a column portion (upright portion) 721 extending in the vertical direction and having a lower end connected to the base 720. The upper end of the column portion 721 directly or indirectly supports the equipment component 57.

[0059] The base 720 is a metal plate, and a through-hole H5 into which the lower part of the column portion 721 is inserted is formed at a position offset (shifted position) to one end side from the central portion, and a through-hole H7 for inserting the screw member B2 is formed at a position offset to the other end side from the central portion. The lower part of the column portion 721 is fitted into the through-hole H5 of the base 720, and the periphery of the column portion 721 is welded to the base 720 in a state where the lower end portion (protrusion 722) protrudes downward from the lower surface of the base 720. In the present embodiment, the bar material constituting the column portion 721 is a round bar, and the lower part inserted into the through-hole H5 is formed to have a smaller diameter than the main portion. However, it is not limited thereto, and the protrusion 722 may have the same diameter as the main portion of the column portion 721.

[0060] At the location where the third support member 72 is disposed on the base plate 55 of the swivel base 52, a support projection 520 is provided. In the support projection 520 and the base plate 55, a positioning hole H6 for fitting the protruding portion 722 and a screw hole S9 for screwing the screw member B2 are provided so as to communicate in the plate thickness direction. Thereby, while fixing the third support member 72 to the base plate 55 with the screw member B2, the third support member 72 can be prevented from rotating by the protruding portion 722 inserted into the positioning hole H6, and the third support member 72 can be attached at a lower cost than in the case of using a plurality of screw members. Note that the positioning hole H6 only needs to be able to fit the protruding portion 722, and may be a through hole or a non-through hole (recess).

[0061] The upper end surface of the third support member 72 is an installation surface 723 on which the step 57 is installed, and is formed in a planar shape orthogonal to its own center line. A screw hole S8 for screwing a male screw member B3, which is a screw member for fixing the step 57, is formed vertically in the upper end surface (installation surface 723) of the support column portion 721.

[0062] In the present embodiment, the step 57 and the driver's seat 50 are disposed at positions offset to one side (the left side in the drawing) from the center in the lateral direction of the swivel base 52.

[0063] Note that the surface (lower surface) facing downward of the base 720 is a machined planar surface, and flatness is ensured by this machining. Further, the support projection 520 is a metal plate material welded to the upper surface of the base plate 55, and the upper surface is an installation surface 520a having flatness ensured by machining (a surface overlapping the surface to be installed of the base 720). Thereby, even without machining the entire upper surface of the base plate 55, the third support member 72 can be accurately attached to the base plate 55. However, the support projection 520 is not essential, and the third support member 72 may be attached to the upper surface of the base plate 55.

[0064] The vertical positions of the installation surfaces 700, 712, and 723 of the first support member 70, the second support member 71, and the third support member 72 in step 57 are located on the same (common) virtual plane. In the space (accommodation space) formed between step 57 and the swivel base 52 (base plate 55), hydraulic hoses, valves, etc. that constitute the hydraulic circuit are arranged. The open portion on the side of the machine body of the accommodation space is covered with a cover 12 which is the exterior of the work machine 1 (see FIGS. 1 and 5). Further, in the work machine 1, a partition wall that divides the first arrangement area A1 and the second arrangement area A2 is erected on the rear side in the front-rear direction of the accommodation space.

[0065] As shown in FIGS. 15 and 16, the fourth support member 73 includes a pair of fixed portions 730, 730 arranged at intervals in the horizontal direction, a pair of upright portions 731, 731 whose lower ends are connected to the respective pair of fixed portions 730, 730 and stand up substantially vertically from the fixed portions 730, 730, and a connecting portion 732 that connects the upper ends of the pair of upright portions 731, 731. The upper surface of the connecting portion 732 is an installation surface 733 on which the fuel tank 40 and the hydraulic oil tank 61 are installed, formed in a planar shape substantially parallel to the base plate 55. Thread holes for screwing male screw members for fixing the fuel tank 40 and the hydraulic oil tank 61 are drilled vertically in the connecting portion 732 (installation surface 733). In the present embodiment, the fourth support member 73 is formed by bending a single metal plate. Each of the pair of fixed portions 730, 730 extends outward in the direction opposite to the facing direction of the pair of upright portions 731, 731 from the lower end portions of the pair of upright portions 731, 731.

[0066] Through holes H8 for inserting male screw members B3, which are screw members for fixing to the base plate 55, are drilled in each of the pair of fixed portions 730, 730. In the present embodiment, a plurality of through holes H8 are provided in the fixed portion 730. In the fixed portion 730, the plurality of through holes H8... are arranged at intervals in the direction along the plate surface of the upright portion 731.

[0067] At the position on the base plate 55 where the fixing portion 730 is attached, a support convex portion 522 with a machined upper surface (ensuring flatness of the upper surface) is provided. Further, at positions corresponding to the through-hole H8 of the fixing portion 730 in the support convex portion 522 and the base plate 55, a screw hole S10 is provided. Thereby, the male screw member B3 is inserted through the through-hole H8 of the fixing portion 730 and screwed into the screw hole S10 of the support convex portion 522 and the base plate 55, and the fourth support member 73 is fixed to the base plate 55.

[0068] As shown in FIG. 16, the fifth support member 74 has the same configuration as the third support member 72. That is, the fifth support member 74 includes a base 740 as a fixing portion attached to the installation surface 521a of the support convex portion 521 provided on the base plate 55, a support column portion 741 standing up from the base 740, and an installation surface 743 formed on the upper surface of the support column portion 741 where the flat support plate 75 is installed. In the installation surface 743, a screw hole S12 for screwing the male screw member B5 for fixing the support plate 75 is drilled in the vertical direction.

[0069] The lower part of the support column portion 741 is fitted into the through-hole H9 provided in the base 740, and the periphery of the support column portion 741 is welded to the base 740 in a state where the lower end portion (protruding portion 742) protrudes below the lower surface of the base 740. The base 740 is a metal plate, and a through-hole H9 into which the lower part of the support column portion 741 is inserted is drilled at a position offset toward one end side from the central portion, and a through-hole H11 for inserting the screw member B4 is drilled at a position offset toward the other end side from the central portion.

[0070] At the arrangement position of the fifth support member 74 on the base plate 55 of the swivel base 52, a support convex portion 521 is provided, and positioning holes H10 for fitting the protruding portion 742 and screw holes S11 for screwing the screw member B4 are provided in communication with each other in the plate thickness direction of the support convex portion 521 and the base plate 55. The installation surface 521a of the support convex portion 521 and the lower surface of the base 740 are machined into flat processed surfaces.

[0071] The height positions of the installation surfaces 733 and 743 on which the support plates 75 in the fourth support member 73 and the fifth support member 74 are disposed are located on the same (common) virtual plane.

[0072] In the present embodiment, as shown in FIG. 9, a plurality (two) of the fourth support members 73 are provided at intervals in the front-rear direction, and the fifth support member 74 is disposed at an interval on the rear side with respect to the fourth support member 73 at the rearmost position among the plurality (two) of the fourth support members 73. The work machine 1 includes, as the support plate 75, a front support plate 75 straddling a plurality of the fourth support members 73 and a rear support plate 75 straddling the fourth support member 73 at the rearmost position and the fifth support member 74, as shown in FIGS. 10, 11, 15, and 16. The fuel tank 40 is supported on the front support plate 75, and the hydraulic oil tank 61 is supported on the rear support plate 75.

[0073] In the present embodiment, between the swing base 52 (base plate 55) and the support plate 75 or the connecting portion 732, another equipment component (in the present embodiment, the swing cylinder 36a, etc.) disposed on the base plate 55 is disposed (see FIG. 9).

[0074] On the step 57, a driver's seat (seating seat) 50, operating devices, etc. are disposed, and the driver's seat protection device 54 covers the periphery of the driver's seat 50 and the like. That is, the driver's seat protection device 54 defines a driver's cab DR in which the driver's seat 50 and the like are disposed together with the step 57 inside.

[0075] Inside the driver's cab DR, the driver's seat 50 is disposed at the rear part on the step 57, and the operating devices are disposed in the vicinity of the driver's seat 50.

[0076] The driver's seat protection device 54 according to this embodiment is a so-called cab, and as shown in FIGS. 4 and 5, it has a roof 540 (ceiling) that constitutes the upper part of the driver's cab DR and wall parts 541, 542, 543, 544 that cover the front, rear, left, and right of the driver's seat 50. That is, the driver's seat protection device 54 has wall parts that partition the inside and outside of the driver's cab DR. The driver's seat protection device (cab) 54 of this embodiment has, as wall parts, a front window 541 arranged in the front, a rear window 542 arranged in the rear, an entrance / exit door 543 and a side window 544 arranged on one side in the lateral direction, and a side window (not shown) on the other side in the lateral direction. Note that the lower part on the rear side of the driver's cab DR is partitioned by a partition wall 9, which will be described later, from the engine room where the engine 4 is arranged.

[0077] As shown in FIG. 17, the driver's seat protection device 54 includes a roof 540 arranged above the driver's seat 50 and a frame 59 that supports the roof 540. That is, the driver's seat protection device 54 has a frame 59 that supports the roof 540 and the window frame and protects the inside of the driver's cab DR during a collision or a rollover. The frame 59 is vibration-proof supported via vibration-proof mounts (vibration-proof mechanisms) 8 on a first support member 70 where the left front part is attached to the left front part of the base plate 55, on a protection device support part 711a of a second support member 71 where the right front part is located, and on a support frame 10, which will be described later, where the left rear part and the right rear part are located. Thereby, the entire driver's seat protection device 54 is supported by the swivel base 52.

[0078] The frame 59 according to this embodiment is formed as a framework by assembling a plurality of members. The frame 59 includes columns 590R, 590L, 591R, and 591L that extend in the vertical direction. More specifically, the frame 59 includes four pillars 590R, 590L, 591R, and 591L as columns that extend in the vertical direction at four positions in the front, rear, left, and right directions. That is, the frame 59 includes a pair of front pillars 590R and 590L arranged on the front side in the front-rear direction, the pair of front pillars 590R and 590L being arranged at intervals in the lateral direction, and a pair of rear pillars 591R and 591L arranged on the rear side in the front-rear direction, the pair of rear pillars 591R and 591L being arranged at intervals in the lateral direction, and a front fixing portion 592 connected to the lower ends of the pair of front pillars 590R and 590L, the front fixing portion 592 being for connecting the pair of front pillars 590R and 590L to the swivel base 52, and a rear fixing portion 593 connected to the lower ends of the pair of rear pillars 591R and 591L, the rear fixing portion 593 being for connecting the pair of rear pillars 591R and 591L to the swivel base 52.

[0079] In this embodiment, the frame 59 has a pair of side frames 594R and 594L that connect the upper ends of the front pillars 590R and 590L and the rear pillars 591R and 591L arranged in the front-rear direction.

[0080] The front fixing portion 592 is connected to the lower ends of the front pillars 590R and 590L as described above. In this embodiment, the front fixing portion 592 extends in the lateral direction and is overlapped with the front end portion of the upper surface of the step 57. In this embodiment, the front fixing portion 592 is set to a length so as to straddle the pair of front pillars 590R and 590L, and the lower ends of the pair of front pillars 590R and 590L are connected. That is, the lower ends of the pair of front pillars 590R and 590L are connected to a common (identical) front fixing portion 592.

[0081] In this embodiment, the front fixing portion 592 is formed in a plate shape. As shown in FIG. 18, a through hole H12 through which a male screw member 82 fixed (connected) to the swivel base 52 is inserted is formed in the front fixing portion 592. In this embodiment, the working machine 1 includes a vibration damping mechanism 8 that suppresses vibration of the frame 59. As shown in FIG. 17, the vibration damping mechanism 8 for the front fixing portion 592 is provided at two locations spaced apart in the lateral direction. Accordingly, the through holes H12 of the front fixing portion 592 are provided at two locations spaced apart in the lateral direction.

[0082] Specifically, the front fixing portion 592 is connected to a first support member 70 and a second support member 71 that support the step 57. Accordingly, as shown in FIG. 18, the step 57 has a hole-shaped or notch-shaped relief portion 570 provided at a position corresponding to the protection device support portion 711a. That is, the step 57 is provided with a relief portion 570 that penetrates in the vertical direction at a position avoiding the position where it is fixed and at the position where the front fixing portion 592 is fixed. In this embodiment, the relief portion 570 is formed in a round hole shape. Accordingly, in this embodiment, the relief portion 570 is referred to as a relief hole. Note that the relief portion 570 is not limited to a round hole shape and may be a notch shape that opens at the edge of the step 57.

[0083] The frame 59 is directly or indirectly supported by the protection device support portion 711a via the relief portion 570. In this embodiment, the frame 59 (driver's seat protection device 54) is fixed to the swivel base 52 via a vibration damping mechanism 8 disposed in the relief portion 570. Here, the vibration damping mechanism 8 interposed between the front fixing portion 592 and the second support member 71 will be described as an example. The vibration damping mechanism 8 is interposed between the protection device support portion 711a and the frame 59. The vibration damping mechanism 8 according to this embodiment includes an elastic member 80 for vibration damping disposed between the protection device support portion 711a and the frame 59. The elastic member 80 is disposed in the relief portion 570 of the step 57.

[0084] More specifically, the vibration isolation mechanism 8 is an elastic member 80 interposed between a second support member 71 fixed to the swivel base 52 and the front fixing portion 592. The elastic member 80 has a through hole 800 penetrating in the vertical direction. The elastic member 80, a cylindrical collar - 81 inserted into the through hole 800 of the elastic member 80, and a male screw member 82 inserted through the collar 81. The male screw member 82 penetrates the through hole H12 of the front fixing portion 592 in the vertical direction in a state of being prevented from coming off with respect to the second support member 71. A female screw member 83 screwed onto the male screw member 82 and applying a compressive force to the elastic member 80 between the installation surface 712 of the second support member 71 and the front fixing portion 592.

[0085] In the vibration isolation mechanism 8 shown in FIG. 18, the through hole H12 of the front fixing portion 592 has a larger diameter than the outer diameter of the collar 81, and the collar 81 is formed so as to be loosely insertable. Accordingly, the elastic member 80 is a large-diameter portion 80a having a larger diameter than the through hole H12 of the front fixing portion 592, and is disposed between the front fixing portion 592 and the support member (second support member) 71. And a small-diameter portion 80b protruding from the upper surface of the large-diameter portion 80a, which is disposed concentrically with the large-diameter portion 80a and can be fitted into the through hole H12 of the front fixing portion 592. The through hole 800 of the elastic member 80 penetrates through the center (center) of the large-diameter portion 80a and the center (center) of the small-diameter portion 80b. In the present embodiment, the small-diameter portion 80b penetrates the through hole H12 of the front fixing portion 592 and protrudes from the upper surface of the front fixing portion 592.

[0086] In the present embodiment, the male screw member 82 is a so-called stud bolt (slotted bolt) having a thread groove over the entire length. Accordingly, one end portion of the male screw member 82 is screwed into the screw hole S6 of the second support member 71. Thereby, the male screw member 82 positions the other end portion upward and stands upright vertically or substantially vertically with respect to the upper surface (installation surface 712) of the support main body portion 711. In the present embodiment, the other end portion of the male screw member 82 penetrates below the second support member 71. A lock nut 85 is screwed onto the other end portion of the male screw member 82.

[0087] On the premise that the vibration isolation mechanism 8 according to this embodiment has the above configuration, a pressing member 84 is provided for transmitting the axial force generated in the male screw member 82 due to the screwing of the female screw member 83 with respect to the male screw member 82 to the elastic member 80. The pressing member 84 is a member disposed on the upper surface side of the front fixing portion 592 and has a through hole 840a for inserting the male screw member 82.

[0088] Specifically, the pressing member 84 is a rigid metal plate portion 840, and includes a plate portion 840 having a donut shape in plan view with a through hole through which the male screw member 82 is inserted formed therein. Thereby, when the female screw member 83 is screwed onto the male screw member 82 inserted into the through hole of the plate portion 840, the female screw member 83 pushes the plate portion 840 downward (toward the front fixing portion 592) side, and applies a compressive force to the elastic member 80.

[0089] In this embodiment, the pressing member 84 includes a pressing elastic member 841 disposed on the lower surface side of the plate portion 840. The pressing elastic member 841 is formed in a donut shape in plan view having a through hole for inserting the male screw member 82, similar to the plate portion 840. Further, the pressing member 84 includes a cylindrical positioning collar 842 protruding downward from the lower surface of the plate portion 840.

[0090] In this embodiment, the through hole 840a of the pressing member 84 is formed by connecting the through hole of the plate portion 840 and the inner hole of the positioning collar 842. The positioning collar 842 has the same or substantially the same inner diameter and outer diameter as the above-mentioned collar 81, and the inner diameter is set to be larger than the diameter of the through hole of the plate portion 840. Accordingly, the pressing elastic member 841 is in a state of being overlapped on the lower surface of the plate portion 840, and the positioning collar 842 is inserted into the through hole. The thickness (length in the vertical direction) of the pressing elastic member 841 is set to be thicker (longer) than the length of the positioning collar 842 in the same direction.

[0091] The pressing member 84 is such that when the female screw member 83 is tightened, the plate portion 840 is pushed downward and presses the front fixing portion 592 and the elastic member 80 downward via the pressing elastic member 841. At this time, the elastic deformation (elastic force) of the pressing elastic member 841 also acts. In the present embodiment the pressing member 84 related to this is in a state where the plate portion 840 has moved downward by a predetermined distance (a state where a predetermined pressing force acts on the front fixing portion 592 and the elastic member 80) due to the tightening of the female screw member 83, and the positioning collar 842 collides (interferes) with the collar 81, and the downward movement is restricted. Thereby, since the pressing member 84 is prevented from being pushed downward beyond the specified value, torque management becomes easy.

[0092] In the present embodiment, the front fixing portion 592 is fixed to the swing base 52 at two locations spaced apart in the lateral direction, and the vibration isolation mechanism 8 having the above configuration is disposed at each fixing position (support position). Also, regarding the rear fixing portion 593, it is fixed to the swing base 52 at two locations spaced apart in the lateral direction, and the vibration isolation mechanism 8 having the above configuration is disposed at each fixing position (support position). In the above description, the front fixing portion 592 was described on the premise of being connected to the second support member 71, so the object of fixing (connection) was the second support member 71, but the same applies when the front fixing portion 592 is connected to the first support member 70.

[0093] Regarding the rear fixing portion 593, as shown in FIG. 17, it is disposed at a position higher than the front fixing portion 592. For this reason, the rear fixing portion 593 is a support frame 10 fixed to the upper surface of the base plate 55 and is connected to the support frame 10 that supports the rear fixing portion 593 at a predetermined height. Therefore, by reading the support member (second support member) 71 in the description of the vibration isolation mechanism 8 above as the first support member 70 or the support frame 10, the description of the fixing (connection) of the front fixing portion 592 to the first support member 70 and the fixing (connection) of the rear fixing portion 593 to the support frame 10 is obtained.

[0094] Returning to FIG. 4, the driver's seat 50 is arranged at the rearmost position in the driver's cab DR (space) within the driver's seat protection device 54 as described above. That is, the driver's seat 50 is arranged in front of the rear fixing portion 593 of the frame 59. Specifically, the driver's seat 50 includes a seat portion having a seat surface on which the operator sits, and a backrest against which the operator sitting on the seat portion (seat surface) leans, and is fixed to the step 57 such that in plan view, the seat surface is located within a region behind the center in the front-rear direction of the step 57. The seat surface and the backrest of the driver's seat 50 are slidable in the front-rear direction, and the backrest is tiltable (reclinable). Accordingly, the backrest of the driver's seat 50 is located on the rear side of the rear end in the front-rear direction of the step 57, but is maintained at a position in front of the rear fixing portion 593.

[0095] The guard member 58 is a metal protection member for protecting the driver's seat protection device 54 (particularly, the front window 541) from the operation of the working device 3 and flying objects scattered by the work of the working device 3. Accordingly, the guard member 58 is arranged in front of the front window 541 so as to overlap the entire surface of the front window 541. Accordingly, the guard member 58 is configured to enable visual recognition of the front situation from the driver's seat 50 (driver's cab DR). That is, the guard member 58 is configured in a lattice shape or a fence shape. In the present embodiment, the guard member 58 is configured in a fence shape.

[0096] The prime mover 4 is located on the rear side of the step 57 and the driver's seat 50 (diagonally downward and rearward of the seat surface).

[0097] The working machine 1 includes a partition wall 9 that partitions the driver's cab DR (the area where the driver's seat 50 is arranged) and the area where the prime mover 4 is arranged (prime mover room). As shown in FIGS. 11 and 17, the partition wall 9 is attached to the front portion of a support frame 10 that supports equipment and the like arranged at the rear portion of the driver's seat protection device 54 and the rear portion of the machine body 5.

[0098] As shown in FIG. 19, the support frame 10 includes a pair of support legs 100, 110 arranged at intervals in the lateral direction, and a leg connecting portion 120 that connects the support legs 100, 110.

[0099] Each of the pair of support legs 100 and 110 includes a front leg portion 101, 111 disposed on the front side, a rear leg portion 102, 112 disposed on the rear side of the front leg portions 101, 111, and beam portions 103, 113 extending in the front-rear direction and connecting the front leg portions 101, 111 and the rear leg portions 102, 112.

[0100] The lower ends of the front leg portions 101, 111 are attached to first support members 70, 70 standing upright on the base plate 55, and include first inclined portions 101a, 111a that are slightly inclined rearward as they go upward, and second inclined portions 101b, 111b that are connected to the upper ends of the first inclined portions 101a, 111a and are inclined rearward at a larger inclination angle than the first inclined portions 101a, 111a as they go upward. The lower end portions of the front leg portions 101, 111 are connected and supported by two first support members 70 that support the left rear corner portion and the right rear corner portion of the step 57.

[0101] The lower ends of the rear leg portions 102, 112 are connected to rear end support members 715, 715 standing upright at the rear end of the base plate 55, and extend in the vertical direction (substantially perpendicular to the swivel base 52 (base plate 55)). The lower end portions of the rear leg portions 102, 112 are connected and supported by rear end support members 715, 715 standing upright at the rear end of the base plate 55.

[0102] The front ends of the beam portions 103, 113 are connected to the upper ends of the second inclined portions 101b, 111b, extend substantially horizontally rearward, and the rear ends are connected to the upper ends of the rear leg portions 102, 112.

[0103] The vertical heights of each of the pair of support legs 100 and 110 are set so that the heights of the respective beam portions 103, 113 are substantially the same.

[0104] One end of the leg connection portion 120 is connected to the beam portion 103 of one support leg 100, extends horizontally, and the other end is connected to the beam portion 113 of the other support leg 110.

[0105] The rear fixing portion 593 of the frame 59 is connected to the leg connecting portion 120 of the support frame 10 via the vibration isolation mechanism 8. As described above, the connection mode between the rear fixing portion 593 and the leg connecting portion 120 which is the connection target of the rear fixing portion 593 is the same as the connection mode between the front fixing portion 592 and the second support member 71. That is, in the vibration isolation mechanism 8 for the rear fixing portion 593, the male screw member (stud bolt) 82 has its other end side positioned upward, and is screwed into the leg connecting portion 120 so as to stand vertically or substantially vertically with respect to the upper surface (installation surface) of the leg connecting portion 120. Based on this, elastic members 80, pressing members 84, etc. are incorporated on the leg connecting portion 120. Further, in the vibration isolation mechanism 8 disposed on the first support member 70 that supports the left front of step 57, the male screw member (stud bolt) 82 has its other end side positioned upward, and is screwed into the screw hole S5 so as to stand vertically or substantially vertically with respect to the upper surface (installation surface) of the installation surface 700. Based on this, elastic members 80, pressing members 84, etc. are incorporated on the leg connecting portion 120.

[0106] As shown in FIG. 20, the partition wall 9 is disposed so as to close (block) the space between the pair of support legs 100, 110 constituting the support frame 10, and is attached to the pair of support legs 100, 110. Specifically, the partition wall 9 includes a first inclined partition wall portion 9a that covers the region between the first inclined portions 101a, 111a of the support legs 100, 110, a second inclined partition wall portion 9b that covers the region between the second inclined portions 101b, 111b of the support legs 100, 110, and a ceiling partition wall portion 9c that covers the region in front of the leg connecting portion 120 between the beam portions 103, 113 of the support legs 100, 110. Further, the second inclined partition wall portion 9b of the partition wall 9 is provided with an inspection port 93 that can be accessed from the driver's seat 50 side to the prime mover 4 side, and a closing body 94 that can close the inspection port 93.

[0107] The partition wall 9 is a sound absorption wall (sound insulation wall) for suppressing the propagation of the sound in the prime mover chamber (such as the driving sound of the prime mover 4) into the driver's cab DR. Specifically, as shown in FIG. 21, the partition wall 9 is A pair of metal plates 90 and 91 are arranged opposite to each other with a space therebetween from the seat rotation 50 side to the prime mover chamber side (hereinafter, one metal plate 90 is referred to as the first metal plate, and the other metal plate 91 is referred to as the second metal plate), and a sound absorbing material 92 and a space maintaining member (spacer) 96 arranged between the first metal plate 90 and the second metal plate 91 are included. Note that the partition wall 9 also has a function of suppressing heat in the prime mover chamber from propagating into the driver's cab DR.

[0108] Each of the metal plates 90 and 91 has a first inclined partition wall portion 9a, a second inclined partition wall portion 9b, and a ceiling partition wall portion 9c integrally formed by bending a single metal plate. Note that each of the metal plates 90 and 91 may be formed by integrating a plurality of plates by welding or the like, or may be divided into a plurality of regions. In the present embodiment, the second metal plate 91 is formed of a thinner plate than the first metal plate 90.

[0109] A space maintaining member 96 for maintaining a constant space between the first metal plate 90 and the second metal plate 91 is arranged therebetween. The space maintaining member 96 is a prismatic member extending from the support leg 100 side to the support leg 110 side. In the present embodiment, as shown in FIG. 22, it is provided at three locations, namely, the upper and lower portions of the first inclined partition wall portion 9a and the rear portion of the ceiling partition wall portion 9c. In the present embodiment, the space maintaining member 96 is fixed to the second metal plate 91 (91a, 91c) by welding. However, it is not limited thereto, and it may be fixed to the first metal plate 90, or may be fixed to both the first metal plate 90 and the second metal plate 91. Further, the space maintaining member 96 may function as a reinforcing member for reinforcing the first metal plate 90 and / or the second metal plate 91.

[0110] In the partition 9, both side ends of the lower part 91a of the second metal plate 91 are in close contact with the front surfaces of the first inclined portions 101a and 111a of the support legs 100 and 110 respectively, both side ends of the central part 91b of the second metal plate 91 are in close contact with the front surfaces of the second inclined portions 101b and 111b of the support legs 100 and 110 respectively, and both side ends of the upper part 91c of the second metal plate 91 are in close contact with the upper surfaces of the beam portions 103 and 113 of the support legs 100 and 110 respectively, and it is attached to the support frame 10 by welding or screw fixing. Note that a part of the first metal plate 90 and a part of the second metal plate 91 may be integrated by welding, bolting, etc., or the first metal plate 90 and the second metal plate 91 may be separately fixed to the support frame 10.

[0111] The sound-absorbing material 92 is a foamed resin (foamed urethane foam) and is in close contact with the pair of metal plates 90 and 91 (the first metal plate 90 and the second metal plate 91). However, the material of the sound-absorbing material 92 is not limited to this, and it may be other foamed resins, or may be a sound-absorbing or sound-insulating material other than the foamed resin. Also, the sound-absorbing material 92 preferably has heat insulation properties that reduce the heat transfer from the engine room to the driver's cab DR.

[0112] As shown in FIGS. 22 and 23, the inspection port 93 has a first opening 93a formed in the first metal plate 90 on the driver's seat 50 side and a second opening 93b formed at a position corresponding to the first opening 93a in the second metal plate 91 on the engine 4 side. In the present embodiment, the opening area of the second opening 93b is formed slightly smaller than that of the first opening 93a.

[0113] The closing body 94 includes a first closing plate 94a made of metal that closes the inspection port 93 in a state of overlapping the driver's seat side surface of the peripheral edge of the first opening 93a in the first metal plate 90 (90b), and a second closing plate 94b made of metal that closes the inspection port 93 in a state of overlapping the driver's seat side surface of the peripheral edge of the second opening 93b in the second metal plate 91 (91b).

[0114] As shown in FIG. 24, a plurality of columnar support portions 910 capable of supporting the second closing plate 94b protrude from the second metal plate 91 toward the first metal plate 90 side. Further, a notch portion 941 that can be fitted into the support portion 910 is formed at the lower end portion of the second closing plate 94b. Note that the shapes and the number of the support portion 910 and the notch portion 941 are not limited to the above configuration, and any shape capable of supporting the second closing plate 94b may be used. Further, the closing body 94 includes a sound absorbing material 97 interposed between the first closing plate 94a and the second closing plate 94b. The shapes and the number of the support portion 910 and the notch portion 941 are not limited to the above configuration, and any shape capable of supporting the second closing plate 94b may be used. Further, the closing body 94 includes a sound absorbing material 97 interposed between the first closing plate 94a and the second closing plate 94b.

[0115] As shown in FIG. 23, holding pieces 940a and 940b protrude from the first closing plate 94a and the second closing plate 94b, respectively. The holding piece 940a provided on the first closing plate 94a protrudes toward the driver's seat 50 side from the surface of the first closing plate 94a facing the driver's seat 50 side. On the other hand, the holding piece 940b provided on the second closing plate 94b protrudes toward the driver's seat 50 side from the upper end of the second closing plate 94b.

[0116] Further, a handle 950 that can be gripped is attached to the first closing plate 94a in addition to the holding piece 940a. The handle 950 includes extending portions 950b and 950b that extend upward from the upper end of the first closing plate 94a, and a gripping portion 950a that connects the upper ends of the extending portions 950b and 950b.

[0117] In the present embodiment, the handle 950 is formed by bending a round bar, and the gripping portion 950a and the pair of extending portions 950b and 950b are continuously integrated, and the ends of the extending portions 950b and 950b are fixed (welded in the present embodiment) to the outer surface of the first closing plate 94a on the driver's seat 50 side.

[0118] The first closing plate 94a is screwed to the first metal plate 90 via a male screw member B6. The second closing plate 94b is screwed to the second metal plate 91 via a male screw member B7. In the present embodiment, through holes for inserting the male screw members B6 and B7 are provided in each of the first metal plate 90 and the second metal plate 91, and nuts (back nuts) concentric with the through holes are attached to the surfaces on the prime mover chamber side.

[0119] In the present embodiment, a seal member 95 for filling a gap is interposed between the opposing portions of the first closing plate 94a and the first metal plate 90. As the seal member 95, for example, a foamed resin, rubber, or the like can be used. Incidentally, a sealing material 98 may also be interposed between the opposing portions of the second closing plate 94b and the second metal plate 91.

[0120] As the sound-absorbing material 97 of the closing body 94, for example, foamed urethane foam or the like can be used. The sound-absorbing material 97 is sandwiched between the first closing plate 94a and the second closing plate 94b and is set to a thickness that closely adheres (preferably, pressure-bonds) to each of the first closing plate 94a and the second closing plate 94b.

[0121] The sound-absorbing material 97 of the closing body 94 is formed in a shape that substantially coincides with the planar shape of the second closing plate 94b and can be fitted from the first opening 93a toward the second metal plate 91 side. The sound-absorbing material 92 (the sound-absorbing material 92 between the first metal plate 90 and the second metal plate 91) of the partition wall 9 is provided with an opening having a shape corresponding to the sound-absorbing material 97 of the closing body 94. By fitting the sound-absorbing material 97 of the closing body 94 into this opening, the sound-absorbing materials 92 and 97 are arranged over substantially the entire area within the plane of the partition wall 9.

[0122] The working machine 1 according to the first embodiment of the present invention is as described above. Subsequently, the working machine 1 according to the second embodiment of the present invention will be described.

[0123] The working machine 1 of the second embodiment has the same configuration as that of the working machine 1 of the first embodiment, except for the partition wall 9. Accordingly, in the following description, for the configurations other than the partition wall 9, detailed description will be omitted with reference to the description of the first embodiment, and here, only the partition wall 9 and the configurations necessary for the description of the partition wall 9 will be described. In referring to the description of the first embodiment, the same configurations or corresponding configurations as those described in the first embodiment will be given the same names and the same reference numerals as those in the first embodiment. Also, in this embodiment as well, the description will be based on the standard posture.

[0124] The partition wall 9 of this embodiment is a sound-absorbing wall (sound-proof wall) for suppressing the propagation of the sound in the prime mover chamber (such as the driving sound of the prime mover 4) into the driver's cab DR. Accordingly, the partition wall 9 is disposed between the driver's cab DR and the prime mover chamber, and partitions the driver's cab DR side and the prime mover chamber side. Specifically, as shown in FIG. 25, the partition wall 9 is disposed so as to close (block) the space between a pair of support legs 100 and 110 that constitute the support frame 10, and is attached to the pair of support legs 100 and 110.

[0125] The partition wall 9 includes a plurality of regions. Similar to the first embodiment, the partition wall 9 of this embodiment has a first inclined partition wall portion 9a, a second inclined partition wall portion 9b, and a ceiling partition wall portion 9c. Thereby, the partition wall 9 includes three regions: the first inclined partition wall portion 9a, the second inclined partition wall portion 9b, and the ceiling partition wall portion 9c. The partition wall 9 includes an inspection port 93 that is accessible from the driver's seat 50 side to the prime mover 4 side, and a closing body 94 that can close the inspection port 93. In the partition wall 9 of this embodiment, the inspection port 93 and the closing body 94 are provided in the second inclined partition wall portion 9b.

[0126] As shown in FIGS. 26 and 27, the partition wall 9 includes a pair of metal plates 90 and 91 arranged to face each other with a space therebetween from the driver's seat 50 side to the engine room side, and a sound-absorbing material 92 disposed between the pair of metal plates 90 and 91. Further, in the present embodiment, as shown in FIGS. 26 to 28, the partition wall 9 is a sealing material 98 having elasticity, which is sandwiched between the pair of metal plates 90 and 91 and surrounds the periphery of the sound-absorbing material 92 disposed between the pair of metal plates 90 and 91.

[0127] The pair of metal plates 90 and 91 (the first metal plate 90 and the second metal plate 91) may be formed in the same shape and size, but in the present embodiment, they are formed in different shapes. Specifically, a notch is formed at the end of the second metal plate 91 on the other side in the lateral direction by cutting out on one side in the lateral direction. Therefore, the pair of metal plates 90 and 91 (the first metal plate 90 and the second metal plate 91) do not face each other entirely, and the first metal plate 90 includes a non-facing region that does not face the second metal plate 91. That is, the outer contour (outer periphery) of the first metal plate 90 and the outer contour (outer periphery) of the second metal plate 91 do not match when viewed from the direction in which they are arranged side by side.

[0128] As shown in FIGS. 26 and 27, the second metal plate 91 is a thinner plate than the first metal plate 90. That is, the plate thickness of the first metal plate 90 is thicker than the plate thickness of the second metal plate 91. Specifically, the plate thickness of the first metal plate 90 is set to be 1.5 times or more that of the second metal plate 91. In the present embodiment, the plate thickness of the first metal plate 90 is 3.2 mm, and the plate thickness of the second metal plate 91 is 2 mm. Therefore, the plate thickness of the first metal plate is set to be 1.6 times that of the second metal plate.

[0129] The sound-absorbing material 92 is disposed between a pair of metal plates 90 and 91, forms a gap G between at least one of the pair of metal plates 90 and 91, and faces the pair of metal plates 90 and 91. The sound-absorbing material 92 is in close contact with one of the pair of metal plates 90 and 91, i.e., the first metal plate 90, and is spaced apart from the other of the pair of metal plates 90 and 91, i.e., the second metal plate 91, to form a gap G therebetween. In the present embodiment, the sound-absorbing material 92 is in close contact with the first metal plate 90 on the driver's seat 50 side of the pair of metal plates 90 and 91, and is spaced apart from the second metal plate 91 of the pair of metal plates 90 and 91 to form a gap G therebetween.

[0130] More specifically, the sound-absorbing material 92 is a foamed resin (foamed urethane foam), as in the first embodiment, and is formed in a plate shape. The thickness of the sound-absorbing material 92 is set to be smaller than the distance between the pair of metal plates 90 and 91. That is, the sound-absorbing material 92 has a thickness required for sound absorption and is set to a thickness that can form a gap G between the metal plates 90 and 91 (the first metal plate 90 and the second metal plate 91) when disposed therebetween.

[0131] As described above, the partition wall 9 of the present embodiment includes a plurality of regions (the first inclined partition wall portion 9a, the second inclined partition wall portion 9b, and the ceiling partition wall portion 9c). Therefore, as shown in FIG. 28, the sound-absorbing material 92 is divided into a plurality of parts and disposed in the corresponding regions. That is, the partition wall 9 includes a plurality of divided sound-absorbing materials 92a, 92b, and 92c as the sound-absorbing material 92 according to the regions where they are disposed.

[0132] More specifically, the sound-absorbing material 92 includes, as a plurality of divided sound-absorbing materials 92a, 92b, and 92c, a first sound-absorbing material 92a for the first inclined partition wall portion 9a, a second sound-absorbing material 92b for the second inclined partition wall portion 9b, and a third sound-absorbing material 92c for the ceiling partition wall portion 9c. Further, since the partition wall 9 has an inspection port 93 and a closing body 94 for closing the inspection port 93, the sound-absorbing material 92 further includes a fourth sound-absorbing material 97 for the closing body 94.

[0133] Each of the first sound-absorbing material 92a, the second sound-absorbing material 92b, the third sound-absorbing material 92c, and the fourth sound-absorbing material 97 is formed in a plate shape and has a thickness required for sound absorption. Also, as shown in FIGS. 26 and 27, each of the first sound-absorbing material 92a, the second sound-absorbing material 92b, the third sound-absorbing material 92c, and the fourth sound-absorbing material 97 is arranged between a pair of metal plates 90, 91 (the first metal plate 90 and the second metal plate 91) and is set to a thickness that can form a gap G between the opposing metal plates 90, 91.

[0134] The first sound-absorbing material 92a and the third sound-absorbing material 92c are formed in a substantially rectangular shape in plan view. That is, the first sound-absorbing material 92a is formed in a rectangular shape in plan view that is slightly smaller than the size of the first inclined partition portion 9a (90a, 91a), and the second sound-absorbing material 92b is formed in a rectangular shape in plan view that is slightly smaller than the ceiling partition portion 9c (90c, 91c). That is, the first sound-absorbing material 92a is set to a size that can be arranged within the first inclined partition portion 9a while securing a placement space for the sealing material 98, and the third sound-absorbing material 92c is set to a size that can be arranged within the ceiling partition portion 9c while securing a placement space for the sealing material 98.

[0135] In the present embodiment, since the inspection port 93 and the closing body 94 are provided in the second inclined partition portion 9b, the second sound-absorbing material 92b is arranged so as to avoid the inspection port 93, and the fourth sound-absorbing material 97 is formed according to the opening size and opening shape of the inspection port 93. In the present embodiment, the second sound-absorbing material 92b is arranged on the other side in the lateral direction with respect to the inspection port 93. For this reason, the second sound-absorbing material 92b is set to a shape that avoids the notch portion of the second metal plate.

[0136] In this embodiment, the first sound-absorbing material 92a is adhered to the first metal plate 90 (90a) of the first inclined partition portion 9a, the second sound-absorbing material 92b is adhered to the first metal plate 90 (90b) of the second inclined partition portion 9b, and the third sound-absorbing material 92c is adhered to the first metal plate 90 (90c) of the ceiling partition portion 90c. Further, the fourth sound-absorbing material 97 is adhered to the first closing plate 94a made of metal that constitutes the closing body 94. That is, in the partition 9 of this embodiment, the sound-absorbing materials 92 (the first sound-absorbing material 92a, the second sound-absorbing material 92b, the third sound-absorbing material 92c, and the fourth sound-absorbing material 97) are attached to the metal plates 90, 94a on the driver's cab DR side.

[0137] The sealing material 98 is a long member made of urethane rubber. The sealing material 98 can be curved in a direction orthogonal or intersecting the longitudinal direction. In this embodiment, the sealing material 98 is formed in a rectangular cross-section. The outer dimension of the sealing material 98 in the direction orthogonal to the longitudinal direction is one set to be larger than the distance between the pair of metal plates 90, 91 (the first metal plate 90 and the second metal plate 91). That is, the sealing material 98 is set to a size that is compressed while being sandwiched between the pair of metal plates 90, 91 when disposed between the pair of metal plates 90, 91.

[0138] In this embodiment, the cross-sectional shape of the sealing material 98 as viewed from the longitudinal direction is a rectangular shape including four sides in the outer contour. Accordingly, among the four sides constituting the outer contour of the sealing material 98, the lengths of at least two sides extending in the same direction are set to be longer than the distance between the pair of metal plates 90, 91 (the first metal plate 90 and the second metal plate 91). In this embodiment, the cross-sectional shape of the sealing material 98 is a square shape, and the length of any of the four sides is set to be longer than the distance between the pair of metal plates 90, 91 (the first metal plate 90 and the second metal plate 91).

[0139] The sealing material 98 surrounds the sound-absorbing material 92. In the present embodiment, since the partition wall 9 includes, as the sound-absorbing material 92, a plurality of divided sound-absorbing materials 92a, 92b, 92c, 97 (first sound-absorbing material 92a, second sound-absorbing material 92b, third sound-absorbing material 92c, and fourth sound-absorbing material 97), the sealing material 98 collectively surrounds all of the plurality of divided sound-absorbing materials 92a, 92b, 92c, 97 (first sound-absorbing material 92a, second sound-absorbing material 92b, third sound-absorbing material 92c, and fourth sound-absorbing material 97) between the pair of metal plates 90, 91. That is, the sealing material 98 is arranged across a plurality of regions of the partition wall 9 to collectively surround the plurality of divided sound-absorbing materials 92a, 92b, 92c, 97 (first sound-absorbing material 92a, second sound-absorbing material 92b, third sound-absorbing material 92c, and fourth sound-absorbing material 97).

[0140] The sealing material 98 is arranged along the outer peripheral edge portions of the metal plates 90, 91. In the present embodiment, as described above, the outer contours (outer perimeters) of the pair of metal plates 90, 91 do not match, and the planar area of the second metal plate 91 is smaller than the planar area of the first metal plate 90. That is, while the second metal plate 91 faces the first metal plate 90 entirely, the first metal plate 90 has a portion that protrudes from the second metal plate 91.

[0141] Accordingly, in the partition wall 9 of the present embodiment, the sealing material 98 is arranged along the outer peripheral edge portion of the second metal plate 91 and is sandwiched and closely attached between the pair of metal plates 90, 91 (first metal plate 90, second metal plate 91). Thereby, the sealing material 98 is arranged in an annular shape. In other words, between the pair of metal plates 90, 91, the sealing material 98 is arranged in an annular shape, and the sound-absorbing material 92 (more specifically, the plurality of divided sound-absorbing materials 92a, 92b, 92c, 97) is arranged within the region surrounded by this sealing material 98.

[0142] The working machine 1 of the present embodiment has the above configuration, and the sound-absorbing effect (quietness) of the partition wall 9 is further enhanced, enabling the driver's cab DR to be comfortable. More specifically, since the partition wall 9 has, in addition to the pair of metal plates 90, 91, the sound-absorbing material 92 and the gap (space) G therebetween, the transmission rate of the sound from the prime mover 4 can be lowered, and the sound propagated to the driver's cab DR can be reduced.

[0143] Also, since the sound-absorbing material 92 is in close contact only with the first metal plate 90 (first metal plate 90), the resonance frequency of the partition wall 9 is changed, so that the generation of resonance sound can be suppressed.

[0144] Furthermore, since the sound-absorbing material 92 is separated from the second metal plate 91 (second metal plate 91), the bubbles of the sound-absorbing material 92, which is a foaming material, are not crushed. The energy of the sound transmitted through the second metal plate 91 is absorbed (attenuated) by the air in the gap G, and the attenuated sound energy is further converted into thermal energy by passing through the sound-absorbing material 92 (bubbles), and is further attenuated. Therefore, the energy of the sound transmitted through the first metal plate 90 (first metal plate 90) becomes very small or disappears. As a result, the quietness of the driver's cab DR is enhanced.

[0145] In particular, since the plate thickness of the first metal plate 90 (first metal plate 90) is thicker than the plate thickness of the second metal plate 91 (second metal plate 91), the mass of the first metal plate 90 (first metal plate 90) is also larger than that of the second metal plate 91 (second metal plate 91). Therefore, according to the mass law, the sound transmission loss amount at the first metal plate 90 (first metal plate 90) is large, so that the sound insulation performance on the driver's cab DR side is high, and the quietness of the driver's cab DR is further enhanced.

[0146] Also, the sealing material 98 sandwiched between the pair of metal plates 90, 91 surrounds the sound-absorbing material 92 (a plurality of divided sound-absorbing materials 92a, 92b, 92c, 97 (first sound-absorbing material 92a, second sound-absorbing material 92b, third sound-absorbing material 92c, and fourth sound-absorbing material 97)), thereby suppressing sound leakage from the partition wall 9 (sound transmission in the direction orthogonal to the sound propagation direction), and also suppressing sound leakage into the driver's cab DR. In particular, by arranging the sealing material 98 along the outer peripheral edge of the second metal plate 91 (second metal plate 91), the vibration (flutter) of the pair of metal plates 90, 91 is suppressed, and the sound propagation (transmission) can be suppressed, thereby also improving the quietness inside the driver's cab DR.

[0147] The work machine 11 according to the second embodiment of the present invention is as described above. Subsequently, the work machine 1 according to the third embodiment of the present invention will be described.

[0148] The work machine 1 of the third embodiment has the same configuration as the work machine 11 of the first embodiment, except for the support member (second support member) 71 that supports the driver's seat protection device 54. Therefore, for the configurations that are the same as or equivalent to the configurations described in the first embodiment, the same names and reference numerals as those in the first embodiment are given, and the description thereof is omitted.

[0149] Similar to the first embodiment, the work machine 1 of the present embodiment is a support member 71 that is detachably attached to a device support body 56 that is attached to a base plate 55 and supports a working device 3, as shown in FIGS. 29 and 30, and includes a support member 71 that supports a driver's seat protection device 54.

[0150] The device support body 56 is disposed at a position slightly offset to one side (the right side when the front-rear direction is taken as a reference) with respect to the center in the lateral direction. In contrast, the driver's cab DR is disposed on the other side in the lateral direction with respect to the device support body 56.

[0151] Accordingly, step 57 is also disposed on the other side in the lateral direction with respect to the device support body 56. Step 57 is supported at a plurality of locations, and one of them (one corner (right corner) in the plan view of step 57) is supported by a support member 71 attached to the device support body 56. The other locations are supported by another support member (third support member) 72.

[0152] As shown in FIGS. 30 to 32, the support member 71 has a base portion 710 attached to the device support body 56 and a support main body portion 711 connected to the base portion 710.

[0153] The base portion 710 is disposed on the installation surface 564 of the device support 56. Accordingly, a pair of through holes H4, H4 for inserting a male screw member B for fixing the second support member 71 to the device support 56 are drilled vertically at positions communicating with a pair of screw holes S3, S3 provided in the installation surface 564 of the device support 56.

[0154] Also in this embodiment, the support member 71 includes a protection device support portion 711a that supports the driver's seat protection device 54 and a step support portion 711b that supports the step 57. In this embodiment, only the protection device support portion 711a that supports the driver's seat protection device 54 is provided in the support main body portion 711. That is, the support main body portion 711 is the protection device support portion 711a, and the step support portion 711b is separate from the support main body portion 711 (protection device support portion 711a). Accordingly, in this embodiment, the support member 71 includes, in addition to the protection device support portion 711a and the step support portion 711b, a support connection portion 713 that connects either one of the base portion 710 or the support main body portion 711 and the step support portion 711b and supports the step support portion 711b at a predetermined position.

[0155] The support main body portion 711 (protection device support portion 711a) is disposed on the upper surface of the base portion 710. The support main body portion 711 is fixed to the base portion 710 so as to avoid the pair of through holes H4, H4 (between the pair of through holes H4, H4). In this embodiment, the base portion 710 disposed on the installation surface 564 of the device support 56 protrudes rearward in the front-rear direction from the installation surface 564 of the device support 56. On the other hand, the rear side in the front-rear direction of the support main body portion 711 (protection device support portion 711a) is accommodated within the upper surface of the base portion 710, unlike the first embodiment. Note that the front side in the front-rear direction of the support main body portion 711 (protection device support portion 711a) protrudes forward from the base portion 710.

[0156] The support body portion 711 (the protection device support portion 711a) is provided with a screw hole S6 for screwing a male screw member B1 for fixing the driver's seat protection device 54 (the frame 59) in the vertical direction. Thereby, as shown in FIG. 33, the support body portion 711 (the protection device support portion 711a) of the support member 71 connects and supports the driver's seat protection device 54 (the frame 59) via the vibration isolation mechanism 8 in the same manner as in the first embodiment.

[0157] As shown in FIG. 34, the step 57 is fixed in a state of being placed on the step support portion 711b. In the present embodiment, the step 57 is screwed to the step support portion 711b. That is, the work machine 1 is a male screw member B1 that fixes the step 57 to the step support portion 711b, and includes a male screw member B1 that is inserted vertically through the step 57 and screwed into the step support portion 711b.

[0158] The step support portion 711b extends in the vertical direction and has a lower end portion connected to the support arm portion 713b and an upper end portion on the opposite side of the lower end portion, which is an upper end portion that supports the step 57. In the present embodiment, as shown in FIG. 31, the step support portion 711b extends in the vertical direction and has a lower end and an upper end in the vertical direction. In the present embodiment, the step support portion 711b is formed in a columnar shape, but the shape of the step support portion 711b is not limited to this, and for example, it may be a prismatic shape. The lower end (lower end portion) of the step support portion 711b is connected (welded) to the support arm portion 713b in a state of passing through a support arm portion 713b, which will be described later, of the support connection portion 713.

[0159] Thereby, the axis (center line) of the step support portion 711b extends in the vertical direction and extends upward from the support arm portion 713b. That is, the step support portion 711b stands on the support arm portion 713b. As shown in FIGS. 31 and 34, the end surface (upper end surface) of the upper end portion of the step support portion 711b is formed in a planar shape that spreads in a direction orthogonal to the center line, and constitutes an installation surface 712 for installing (placing) the step 57. A screw hole S7 for screwing a male screw member B1 for fixing the step 57 is drilled in the vertical direction in the upper end surface (upper surface) of the step support portion 711b.

[0160] The vertical length (height) of the step support portion 711b is set based on the position (height) of the support arm portion 713b so that the upper end surface (installation surface 712) of the step support portion 711b can support the step 57 at a predetermined position (height).

[0161] As shown in FIGS. 31 and 32, the support connecting portion 713 is connected to either the base portion 710 or the support main body portion 711, and includes a support extending portion 713a extending vertically from the one and a support arm portion 713b extending in a direction intersecting the vertical direction from the support extending portion 713a, and the connected support arm portion 713b of the step support portion 711b.

[0162] At least one of the support extending portion 713a and the support arm portion 713b is configured to be elastically deformable at least in a direction intersecting the vertical direction. In the present embodiment, both the support extending portion 713a and the support arm portion 713b are elastically deformable in a direction intersecting the vertical direction. That is, the support extending portion 713a is elastically deformable in a direction orthogonal to the vertical direction. In contrast, the support arm portion 713b is elastically deformable in a direction orthogonal to the extending direction. The deformation here includes not only bending that bends in a curved shape but also twisting around a predetermined axis.

[0163] More specifically described. The support extending portion 713a hangs down from either the base portion 710 or the support main body portion 711. In the present embodiment, the support connecting portion 713 is connected to the base portion 710. More specifically, the support extending portion 713a is connected to the lower surface of the portion protruding rearward in the front-rear direction from the installation surface 564 of the device support 56 of the base portion 710 and hangs down from the lower surface of the base portion 710.

[0164] The support extension part 713a and the support arm part 713b of this embodiment are formed in a strip shape. Thereby, each of the support extension part 713a and the support arm part 713b has a surface that spreads in the longitudinal direction and the short-side direction orthogonal to the longitudinal direction, and has a thickness in the direction orthogonal to the longitudinal direction and the short-side direction. Along with this, each of the support extension part 713a and the support arm part 713b can be deformed (elastically deformed) in a curved shape in the thickness direction. Also, each of the support extension part 713a and the support arm part 713b can be torsionally deformed (elastically deformed) about an axis (center line) extending in the longitudinal direction. Note that the support extension part 713a and the support arm part 713b are not limited to a strip shape, and may be formed, for example, in a rod shape (round rod shape or square rod shape).

[0165] The support extension part 713a hangs down in the longitudinal direction. The support arm part 713b extends in the longitudinal direction. In this embodiment, the support extension part 713a and the support arm part 713b form a right angle. More specifically, the support arm part 713b is connected to the lower end part of the support extension part 713a and extends in a direction orthogonal to the direction (longitudinal direction) in which the support extension part 713a hangs down.

[0166] As described above, as each of the support extension part 713a and the support arm part 713b is formed in a strip shape, the support arm part 713b extends in the thickness direction of the support arm part 713b. In this embodiment, the support extension part 713a and the support arm part 713b are integrally formed. Specifically, the support extension part 713a and the support arm part 713b are integrally formed by bending a metal strip. Note that when the support extension part 713a and the support arm part 713b are formed in a rod shape, they may be integrally formed by bending a metal rod.

[0167] As shown in FIGS. 30 and 32, the support arm part 713b extends from the base part 710 to the rear end side of the base plate 55. The support arm part 713b extends in the direction in which a virtual tangent line VL1 to a virtual circle VC centered on the turning center CL extends.

[0168] In the present embodiment, as shown in FIG. 32, the support arm portion 713b extends in a direction of a virtual tangent line VL1 that is a virtual tangent to a virtual circle VC centered on the turning center CL and that extends in a direction orthogonal to each of the front-rear direction and the up-down direction of the base plate 55 (or a virtual tangent to the virtual circle VC). More specifically, the support arm portion 713b extends at an angle θ° of 45° or less in a plan view with respect to a virtual straight line VL2 that extends in a direction orthogonal to each of the front-rear direction and the up-down direction of the base plate 55. That is, the extending direction (angle θ°) of the support arm portion 713b is set so that at least a force in the front-rear direction orthogonal to the up-down direction acts as a load for elastically deforming the support connecting portion 713. In the present embodiment, the support arm portion 713b extends at an angle of approximately 20° in a plan view with respect to the virtual straight line VL2.

[0169] The working machine 1 of the present embodiment is as described above. In addition to the actions and effects of the working machines 1 of the first and second embodiments, an effect is obtained in that loosening of the male screw member B1 that fixes the step 57 is prevented and the step 57 can be stably arranged.

[0170] The embodiments of the present invention (the first to third embodiments) are as described above, and the present invention (preferred embodiments thereof) provides the working machine 1 described in the following items.

[0171] (Item 1-1) A working machine 1 including a prime mover 4, a driver's seat 50 arranged at an interval from the prime mover 4, and a partition wall 9 arranged between the prime mover 4 and the driver's seat 50, the partition wall 9 including a pair of metal plates 90, 91 arranged to face each other with a gap in a direction from the prime mover 4 toward the driver's seat 50.

[0172] According to the working machine 1 of item 1-1, since the partition wall 9 is arranged between the driver's seat 50 and the prime mover 4, among the driving sounds (operating sounds) during the operation of the prime mover 4, the driving sounds propagated to the driver's seat 50 side are absorbed by the partition wall 9. Specifically, since the partition wall 9 includes a pair of metal plates 90 and 91 arranged at intervals in the direction from the prime mover 4 toward the driver's seat 50 (the direction in which the prime mover 4 and the driver's seat 50 are spaced apart), the driving sound of the prime mover 4 collides with the metal plate 91 on the prime mover 4 side and is attenuated, and then is propagated to the driver's seat 50 side. However, since the pair of metal plates 90 and 91 are arranged at intervals, the driving sound of the prime mover 4 propagated to the driver's seat 50 side is further attenuated between the pair of metal plates 90 and 91, and collides with the metal plate 90 on the driver's seat 50 side and is attenuated. Thereby, the driving sound (operating sound) of the prime mover 4 is absorbed step by step by the partition wall 9. Therefore, according to the working machine 1 of item 1-1, the quietness of the driver's seat 50 can be further enhanced.

[0173] In particular, since the pair of metal plates 90 and 91 included in the partition wall 9 are made of metal and have a large mass (surface density), the sound transmission loss is large and the sound absorption effect is excellent, so the quietness on the driver's seat 50 side becomes higher. Note that since the metal plates 90 and 91 have a large sound transmission loss, a high sound absorption effect can be obtained even if they are thin, but a higher sound absorption effect can be obtained if the thickness (weight) increases. Also, since the partition wall 9 is a double wall, the heat transfer to the driver's seat 50 side can be efficiently suppressed.

[0174] (Item 1-2) The working machine 1 according to item 1-1, wherein the partition wall 9 includes a sound absorbing material 92 arranged between the pair of metal plates 90 and 91.

[0175] According to the working machine 1 of item 1-2, the sound absorbing material 92 effectively absorbs the sound of the prime mover 4 between the pair of metal plates 90 and 91. That is, since the sound absorbing material 92 is excellent in specializing in sound absorption (absorbing sound), the sound transmitted to the metal plate 90 on the driver's seat 50 side is transmitted in a greatly attenuated state. Therefore, the metal plate 90 on the driver's seat 50 side further attenuates the sound attenuated by the sound absorbing material 92, so that the sound transmitted to the driver's seat 50 disappears or becomes extremely small, and the quietness at the driver's seat 50 is further enhanced.

[0176] (Item 1-3) The sound absorbing material 92 is disposed between the pair of metal plates 90 and 91, and forms a gap G between at least one of the pair of metal plates 90 and 91, and faces the pair of metal plates 90 and 91. The working machine 1 according to item 1-2.

[0177] According to the working machine 1 of item 1-3, the sound absorbing material 92 and the gap (space) G between the pair of metal plates 90 and 91 can reduce the sound transmission rate of the entire partition wall 9. Thereby, the propagation of the sound of the prime mover 4 to the driver's seat 50 side can be suppressed, and the quietness at the driver's seat 50 is further enhanced.

[0178] (Item 1-4) The sound absorbing material 92 is in close contact with one of the pair of metal plates 90 and 91, and is separated from the other metal plate 91 of the pair of metal plates 90 and 91 to form a gap G therebetween. The working machine 1 according to item 1-3.

[0179] According to the working machine 1 of item 1-4, since the sound absorbing material 92 is in close contact with one of them, the resonance frequency of the partition wall 9 is changed, so that the generation of resonance sound can be suppressed. Further, since the sound absorbing material 92 is separated from the other metal plate 91 to form a gap G between the sound absorbing material 92 and the other metal plate 91, the state in which the sound absorbing material 92 is crushed (pressed) is avoided. Thereby, the function of the sound absorbing material 92 can be sufficiently exerted.

[0180] (Item 1-5) The sound-absorbing material 92 is in close contact with one of the pair of metal plates 90 and 91 on the driver's seat 50 side, and is spaced apart from the other metal plate 91 of the pair of metal plates 90 and 91 to form a gap G therebetween. The working machine 1 according to Item 1-4.

[0181] According to the working machine 1 of Item 1-5, since the sound-absorbing material 92 is in close contact with one of the pair of metal plates 90 on the driver's seat 50 side, generation of resonance sound on the driver's seat 50 side can be suppressed. Further, the sound with weakened energy passes through the gap G and attempts to pass through one of the metal plates 90 and the sound-absorbing material 92. Therefore, the combination of the metal plate 90 and the sound-absorbing material 92 further absorbs the energy of the weakened sound. Thereby, propagation of the sound of the prime mover 4 to the driver's seat 50 side can be suppressed, and the quietness at the driver's seat 50 is further enhanced.

[0182] (Item 1-6) The plate thickness of the one metal plate 90 is thicker than the plate thickness of the other metal plate 91. The working machine 1 according to Item 1-5.

[0183] According to the working machine 1 of Item 1-6, since the plate thickness of one metal plate 90 is thicker than that of the other metal plate 91, the mass (weight) of one metal plate 90 is also larger (heavier) than that of the other metal plate 91. Therefore, according to the mass law, the sound transmission rate of one metal plate 90 on the driver's seat 50 side becomes smaller, and sound absorption on the driver's seat 50 side can be enhanced.

[0184] (Item 1-7) The partition wall 9 is a sealing material 98 having elasticity, and includes a sealing material 98 sandwiched between the pair of metal plates 90 and 91 and surrounding the periphery of the sound-absorbing material 92 disposed between the pair of metal plates 90 and 91. The working machine 1 according to any one of Items 1-3 to 1-6.

[0185] According to the working machine 1 of Items 1-7, since the sound-absorbing material 92 is surrounded by the sealing material 98, sound leakage in the direction orthogonal to the facing direction of the pair of metal plates 90, 91 can also be suppressed.

[0186] (Item 1-8) The working machine 1 according to Item 1-7, wherein the sealing material 98 is arranged along the outer peripheral edge of the metal plate 91.

[0187] According to the working machine 1 of Items 1-8, since the sealing material 98 is arranged along the outer peripheral edge of the metal plate 91, generation of vibration of the metal plates 90, 91 can be suppressed, and generation of vibration sound (so-called rattling sound) of the metal plates 90, 91 can also be suppressed.

[0188] (Item 1-9) The working machine 1 according to Item 1-2, wherein the sound-absorbing material 92 is in close contact with the pair of metal plates 90, 91.

[0189] According to the working machine 1 of Items 1-9, since the sound-absorbing material 92 is in close contact with the pair of metal plates 90, 91, the driving sound of the prime mover 4 is continuously and multi-stagedly absorbed. Thereby, the absorption rate of the sound propagated to the driver's seat 50 side can be increased.

[0190] (Item 1-10) The working machine 1 according to any one of Items 1-2 to Items 1-9, wherein the sound-absorbing material 92 is a foamed resin.

[0191] According to the working machine 1 of Items 1-10, since the sound-absorbing material 92 is a foamed resin, the partition wall 9 has an excellent sound absorption effect. That is, since the foamed resin has a large number of air bubbles (voids), it has an excellent sound attenuation effect. Thereby, by arranging the sound-absorbing material 92 made of foamed resin between the pair of metal plates 90, 91, the quietness at the driver's seat 50 is enhanced.

[0192] (Item 1-11) The pair of metal plates 90 and 91 includes a first metal plate 90 on the driver's seat 50 side and a second metal plate 91 on the prime mover 4 side. The partition wall 9 is provided with an inspection port 93 accessible from the driver's seat 50 side to the prime mover 4 side and a closing member 94 capable of closing the inspection port 93. The first metal plate 90 has a first opening 93a that constitutes the inspection port 93, and the second metal plate 91 has a second opening 93b that constitutes the inspection port 93. The closing member 94 includes a first closing plate 94a made of metal that closes the first opening 93a in a state of overlapping the surface on the driver's seat 50 side of the peripheral edge of the first opening 93a in the first metal plate 90, and a second closing plate 94b made of metal that closes the second opening 93b in a state of overlapping the surface on the driver's seat 50 side of the peripheral edge of the second opening 93b in the second metal plate 91. The working machine 1 according to any one of Items 1-1 to 1-10.

[0193] According to the working machine 1 of Item 1-11, by removing the closing member 94, the inspection port 93 is opened, so that it is possible to access the prime mover 4 and the like through the inspection port 93 from the driver's seat 50 side, and inspection and maintenance are possible. In addition, the closing member 94 for closing the inspection port 93 includes a first closing plate 94a made of metal that closes the first opening 93a that constitutes the inspection port 93 in a state of overlapping the first metal plate 90 on the driver's seat 50 side, and a second closing plate 94b made of metal that closes the second opening 93b that constitutes the inspection port 93 in a state of overlapping the second metal plate 91 on the prime mover 4 side. Therefore, even if the inspection port 93 is provided, the first closing plate 94a and the second closing plate 94b absorb the driving sound (operating sound) of the prime mover 4 in the same manner as the pair of metal plates 90 and 91 included in the partition wall 9.

[0194] (Item 1-12) The working machine 1 according to Item 1-11, wherein the first opening 93a is formed in a shape that allows the second closing plate 94b to pass from the driver's seat 50 side to the second metal plate 91 side.

[0195] According to the working machine 1 of items 1-12, since the first opening 93a is formed in a shape that allows the second closing plate 94b to pass from the driver's seat 50 side to the second metal plate 91 side, when opening and closing the inspection port 93, both the first closing plate 94a and the second closing plate 94b can be attached and detached from the driver's seat 50 side.

[0196] (Item 1-13) The working machine 1 according to item 1-11, wherein the first closing plate 94a is screwed to the first metal plate 90, and the second closing plate 94b is screwed to the second metal plate 91.

[0197] According to the working machine 1 of items 1-13, since each of the first closing plate 94a and the second closing plate 94b is screwed to the metal plates 90 and 91, the first closing plate 94a and the second closing plate 94b can be attached and detached only by screwing on and off. That is, it is easy to open and close the inspection port 93.

[0198] (Item 1-14) The working machine 1 according to item 1-11, wherein a sealing member 95 is interposed in at least one of the overlapping portions where the first closing plate 94a overlaps the first metal plate 90 and the overlapping portion where the second closing plate 94b overlaps the second metal plate 91.

[0199] According to the working machine 1 of items 1-14, even in a manner in which a gap is formed in the overlapping portion where the first closing plate 94a overlaps the first metal plate 90 and the overlapping portion where the second closing plate 94b overlaps the second metal plate 91, the sealing member 95 fills the gap, so that the sound not absorbed in the previous stage is prevented from leaking out through the gap. In addition, it is suppressed that the first closing plate 94a and one of the metal plates 90 dynamically interfere (rattle occurs) due to vibration, or the second closing plate 94b and the other metal plate 91 dynamically interfere (rattle occurs).

[0200] (Item 1-15) The partition wall includes a spacing maintaining member 96 that maintains the spacing between the pair of metal plates 90 and 91 between the pair of metal plates 90 and 91, and the working machine 1 according to any one of Items 1-1 to 1-14.

[0201] According to the working machine 1 of Item 1-15, since the spacing between the pair of metal plates 90 and 91 is kept constant by the presence of the spacing maintaining member 96, it is maintained at a spacing suitable for absorbing the driving sound (operating sound) of the prime mover 4.

[0202] (Item 1-16) In the working machine 1 according to Item 1-11, a support portion 910 capable of mounting and supporting the second closing plate 94b is protruded toward the first metal plate 90 on the second metal plate 91.

[0203] According to the working machine 1 of Item 1-16, when attaching and detaching the second closing plate 94b, it can be placed (supported) on the support portion 910, and it is possible to prevent the second closing plate 94b from accidentally falling. That is, since the second closing plate 94b is made of heavy metal, when attaching and detaching it to and from the second metal plate 91, there is a possibility of dropping it between the pair of metal plates 90 and 91. However, by placing (supporting) it on the support portion 910, the second closing plate 94b can be attached and detached without accidentally dropping it.

[0204] (Item 2-1) The working machine 1 includes a machine body 5, a traveling device 2 that supports the machine body 5 so as to be capable of traveling, and a working device 3 (3a) attached to the machine body 5. The machine body 5 is a base plate 55 supported by the traveling device 2, a base plate 55 that can turn about an axis extending in the vertical direction with the turning center CL, a device support body 56 attached to the base plate 55 that supports the working device 3 (3a), a driver's seat 50 disposed on the base plate 55, and a driver's seat protection device 54 that protects the driver's seat 50. A support member 71 that supports the driver's seat protection device 54 is detachably attached to the device support body 56.

[0205] According to the working machine 1 of item 2-1, since the support member 71 that supports the driver's seat protection device 54 is detachable from the device support 56 of the swivel base 52, the support member 71 can be removed from the device support 56. Thereby, when performing work on the base plate 55 (swivel base 52), if the support member 71 gets in the way of the work, by removing the support member 71, assembly and maintenance performed on the base plate 55 can be carried out efficiently. Therefore, the working machine 1 of item 2-1 can mount the driver's seat protection device without degrading the assemblability and maintainability of the members arranged on the swivel base.

[0206] (Item 2-2) The working machine 1 according to item 2-1 includes a swivel bearing 53 supported by the traveling device 2, and the base plate 55 is fixed to the swivel bearing 53 via a plurality of male screw members Bv arranged in an annular region CA that projects and overlaps the swivel bearing 53 in the vertical direction. The support member 71 has a base portion 710 attached to the device support 56 at a position deviated from a position that projects and overlaps the male screw member Bv in the vertical direction, and a support main body portion 711 connected to the base portion 710 and at least a part of which is arranged at a position that projects and overlaps the male screw member Bv in the vertical direction. A protection device support portion 711a for supporting the driver's seat protection device 54 is provided on the support main body portion 711.

[0207] According to the working machine 1 of item 2-2, the support main body portion 711 provided with the protection device support portion 711a for supporting the driver's seat protection device 54 is arranged at a position that projects and overlaps the male screw member Bv for fixing the swivel bearing 53 in the vertical direction. However, when performing inspection and maintenance regarding the attachment of the base plate 55 to the swivel bearing 53 and the fixing (connection) between the swivel bearing 53 and the base plate 55, if the support member 71 (support main body portion 711) gets in the way, by removing the base portion 710 from the device support 56, the entire support member 71 can be removed, facilitating access to the base plate 55 and the male screw member Bv.

[0208] In particular, since the base portion 710 of the support member 71 is attached to the device support 56 at a position offset from the position that projects vertically onto the male screw member Bv, when the support member 71 (base portion 710) is removed from the device support 56, it becomes possible to access the male screw member Bv from directly above. That is, since there is no device support 56 or the like directly above the male screw member Bv, tools (for example, wrenches such as box wrenches) can be accessed from directly above the male screw member Bv. As a result, the tool can be properly attached to the male screw member Bv and the tool can be properly operated, so that torque management of the male screw member Bv that fixes the swivel bearing 53 can be appropriately performed.

[0209] (Item 2-3) The device support 56 has a planar installation surface 564 for installing the support member 71 on its upper surface, and the base portion 710 is disposed on the installation surface 564 and is fixed to the device support 56 by a screw member B. The protective device support portion 711a is provided at a portion that avoids a portion that projects vertically and overlaps the installation surface 564 in at least one of the base portion 710 and the support main body portion 711. The working machine 1 according to Item 2-2.

[0210] According to Item 2-3, since the protective device support portion 711a is provided at a portion that avoids a portion that projects vertically and overlaps the installation surface 564 in at least one of the base portion 710 and the support main body portion 711, the protective device support portion 711a exists at a position protruding from the installation surface 564. As a result, the protective device support portion 711a of the support member 71 projects vertically and overlaps the annular region CA in the vertical direction, so that the driver's seat protection device 54 is supported offset toward the swivel bearing 53 side from the device support 56. As a result, the driver's seat 50 can also be displaced and arranged. That is, the driver's seat 50 and the driver's seat protection device 54 are arranged at positions away from the working device 3 (3a). Thereby, it is possible to suppress the operation of the working device 3 (3a) from affecting the driver's seat 50 side.

[0211] (Item 2-4) The screw member B has a head and a screw portion having a smaller diameter than the head. The base portion 710 has a through hole H4 through which the screw portion is inserted, and a screw hole S3 into which the screw portion is screwed is formed in the installation surface 564. The support main body portion 711 is disposed in a region on the upper surface of the base portion 710 that avoids the through hole H4 and is connected to the base portion 710. The vertical thickness of the support main body portion 711 is set to be thicker than the height of the head. The working machine 1 according to item 2-3.

[0212] According to the working machine 1 of item 2-4, since the vertical thickness of the support main body portion 711 is set to be thicker than the height of the head, the screw member B that fixes the support member 71 does not protrude beyond the upper surface of the support main body portion 711. Thereby, interference between the frame 59 and the screw member B is prevented.

[0213] (Item 2-5) The working machine 1 according to item 2-2 includes a vibration isolation mechanism 8 that vibrationally supports the driver's seat protection device 54, and the vibration isolation mechanism 8 is interposed between the protection device support portion 711a and the driver's seat protection device 54.

[0214] According to the working machine 1 of item 2-5, since the vibration isolation mechanism 8 is interposed between the protection device support portion 711a and the driver's seat protection device 54, vibration of the entire driver's seat protection device 54 is suppressed.

[0215] (Item 2-6) The working machine 1 according to item 2-2 includes a step 57 that is a floor board for supporting the driver's seat 50, and the support member 71 includes the protection device support portion 711a and a step support portion 711b that supports the step 57.

[0216] According to the working machine 1 of Item 2-6, since the support member 71 includes a protection device support portion 711a and a step support portion 711b that supports the step 57, with one support member 71, in addition to the driver's seat protection device 54, the step 57 can also be supported. That is, it is possible to support the step 57 without separately providing a support member for supporting the step 57 at a corresponding predetermined position.

[0217] (Item 2-7) The step 57 is fixed in a state of being placed on the step support portion 711b, and the support member 71 connects either the base portion 710 or the support main body portion 711 to the step support portion 711b and supports the step support portion 711b at a predetermined position. The working machine 1 according to Item 2-6, comprising a support connection portion 713 that connects either the base portion 710 or the support main body portion 711 to the step support portion 711b and is elastically deformable at least in a direction intersecting the vertical direction.

[0218] According to the working machine 1 of Item 2-7, it is possible to prevent the force transmitted from the working device 3 during operation to the device support 56 from affecting (damaging) the boundary between the step 57 and the step support portion 711b (the fixed portion of the step 57 with respect to the step support portion 711b). Specifically, the force applied to the working device 3 during operation (the force in the front-rear direction and the lateral direction (vehicle width direction) that intersects (is orthogonal to) the vertical direction) also acts on the device support 56 that supports the working device 3, and further acts on the base portion 710 and the support main body portion 711 attached to the device support 56. However, according to the working machine 1 of Item 2-7, it includes a support connection portion 713 that connects either the base portion 710 or the support main body portion 711 to the step support portion 711b, and since the support connection portion 713 is elastically deformable at least in a direction intersecting the vertical direction, when a large force acts in a direction intersecting the vertical direction, the support connection portion 713 elastically deforms to absorb the force from the working device 3. As a result, it is possible to suppress the force from the working device 3 from affecting (damaging) the boundary between the step 57 and the step support portion 711b (the fixed portion of the step 57 with respect to the step support portion 711b).

[0219] (Item 2-8) The male screw member B1 that fixes the step 57 to the step support portion 711b, the male screw member B1 being inserted in the vertical direction with respect to the step 57 and screwed into the step support portion 711b, the working machine 1 according to Item 2-7.

[0220] According to the working machine 1 of Item 2-8, by removing the male screw member B1, the step 57 can be removed from the step support portion 711b, so that maintenance and the like can be easily performed. By the way, when the step 57 is fixed to the step support portion 711b by the male screw member B1, when a large force repeatedly acts in a direction intersecting the vertical direction on the boundary between the step 57 and the step support portion 711b (the fixed portion of the step 57 with respect to the step support portion 711b), the male screw member B1 tends to loosen. However, according to the working machine 11 of Item 2-8, since the support connecting portion 713 is elastically deformable at least in a direction intersecting the vertical direction, when a large force acts in a direction intersecting the vertical direction, the support connecting portion 713 elastically deforms and absorbs the force from the working device 3. Therefore, a large force (impact force) does not repeatedly act on the boundary between the step 57 and the step support portion 711b (the fixed portion of the step 57 with respect to the step support portion 711b), loosening of the male screw member B1 is prevented, and the step 57 can be maintained in a fixed state.

[0221] (Item 2-9) The support connecting portion 713 is connected to either the base portion 710 or the support main body portion 711, and includes a support extending portion 713a extending in the vertical direction from the one, and a support arm portion 713b extending in a direction intersecting the vertical direction from the support extending portion 713a, and the support arm portion 713b to which the step support portion 711b is connected, and at least one of the support extending portion 713a and the support arm portion 713b is elastically deformable at least in a direction intersecting the vertical direction, the working machine 1 according to Item 2-7.

[0222] According to the working machine 1 of item 2-9, the step support portion 711b can be arranged in a desired appropriate position, and at least one of the support extension portion 713a and the support arm portion 713b elastically deforms in a direction intersecting at least the vertical direction, thereby preventing damage to the boundary between the step 57 and the step support portion 711b (the fixed portion of the step 57 with respect to the step support portion 711b).

[0223] (Item 2-10) The working machine 1 according to item 2-9, wherein the support extension portion 713a hangs down from either the base portion 710 or the support main body portion 711.

[0224] According to the working machine 1 of item 2-10, since the support extension portion 713a hangs down from either the base portion 710 or the support main body portion 711, the support arm portion 713b is located below the support extension portion 713a with respect to the base portion 710 or the support main body portion 711. Therefore, the arrangement of the step support portion 711b (the position supporting the step 57) can be set within a range from a position below the base portion 710 or the support main body portion 711 to a position above the base portion 710 or the support main body portion 711.

[0225] (Item 2-11) The working machine 1 according to item 2-9, wherein the support extension portion 713a is elastically deformable in a direction orthogonal to the vertical direction, and the support arm portion 713b is elastically deformable in a direction orthogonal to the extending direction.

[0226] According to the working machine 1 of item 2-11, since the support extension portion 713a and the support arm portion 713b are elastically deformable, these elastic deformations (deformations by combination) can absorb forces not only in a specific direction but also in a direction orthogonal to the vertical direction.

[0227] (Item 2-12) The working machine 1 according to item 2-9, wherein the support extension portion 713a and the support arm portion 713b are formed in a strip shape, the support extension portion 713a hangs down in the longitudinal direction, and the support arm portion 713b extends in the longitudinal direction.

[0228] According to the working machine 1 of Item 2-12, since the support extension part 713a and the support arm part 713b are formed in a strip shape and the longitudinal direction is aligned with the downward direction or the extending direction, elastic deformation in the thickness direction is possible. Furthermore, elastic deformation in the torsional direction (rotation direction) around the axis extending in the longitudinal direction is also possible, and forces in many directions can be absorbed.

[0229] (Item 2-13) The working machine 1 according to Item 2-12, wherein the support extension part 713a and the support arm part 713b are integrally formed by bending a metal strip.

[0230] According to the working machine 1 of Item 2-13, since the support extension part 713a and the support arm part 713b are integrally formed by bending a metal strip, there is no need to perform welding or the like at the connection portion between the support extension part 713a and the support arm part 713b. Further, since the support extension part 713a and the support arm part 713b are continuous, the entire support connection part 713 can be elastically deformed.

[0231] (Item 2-14) The working machine 1 according to Item 2-9, wherein the support arm part 713b extends at an angle of 45° or less with respect to a virtual line extending in a direction orthogonal to each of the front-rear direction and the up-down direction of the base plate 55.

[0232] According to the working machine 1 of Item 2-14, when forces in the front-rear direction of the base plate 55 and forces in a direction orthogonal or intersecting with the front-rear direction act, the support arm part 713b is easily elastically deformed, and those forces can be absorbed.

[0233] (Item 2-15) The working machine 1 according to Item 2-14, wherein the support arm part 713b extends in the extending direction of a virtual tangent line VL1 with respect to a virtual circle VC centered on the turning center CL.

[0234] According to the working machine 1 of Item 2-15, when the force transmitted from the working device 3 during operation to the device support 56 acts in a direction orthogonal or intersecting with the virtual tangent VL1 to the virtual circle VC centered on the turning center CL, the support arm portion 713b is likely to elastically deform, and these forces can be absorbed. Specifically, by setting the extending direction of the support arm portion 713b based on the virtual tangent VL1 to the virtual circle VC centered on the turning center CL, even when the base plate 55 turns around the turning center CL and the position of the device support 56 changes, the support arm portion 713b is likely to elastically deform due to the force transmitted from the working device 3, and these forces can be absorbed.

[0235] (Item 2-16) The step support portion 711b extends in the vertical direction and has a lower end portion connected to the support arm portion 713b and an upper end portion on the opposite side of the lower end portion, the upper end portion supporting the step 57. The working machine 1 according to Item 2-9.

[0236] According to the working machine 1 of Item 2-16, since the step support portion 711b extends in the vertical direction, the upper end supporting the step 57 can be arranged at an appropriate position (height).

[0237] (Item 2-17) The protection device support portion 711a and the step support portion 711b are provided on the upper surface of the support main body portion 711. The step 57 has a hole-shaped or notch-shaped relief portion 570 provided at a position corresponding to the protection device support portion 711a. The driver's seat protection device 54 is directly or indirectly supported by the protection device support portion 711a via the relief portion 570. The working machine 1 according to Item 2-6.

[0238] According to the working machine 1 of item 2-17, since the protection device support portion 711a and the step support portion 711b for supporting the step 57 are provided on the upper surface of the support main body portion 711, it is possible to support the step 57 in addition to the driver's seat protection device 54. That is, it is possible to support the step 57 without separately providing a support member for supporting the step 57 for a corresponding predetermined position. In particular, the step 57 has a hole-shaped or notch-shaped relief portion 570 provided at a position corresponding to the protection device support portion 711a, and the driver's seat protection device 54 is directly or indirectly supported by the protection device support portion 711a via the relief portion 570. Therefore, the protection device support portion 711a reliably supports the driver's seat protection device 54 without sandwiching the step 57.

[0239] (Item 2-18) The working machine 1 according to item 2-17, comprising a vibration isolation mechanism 8 for vibration isolation support of the driver's seat protection device 54, and at least a part of the vibration isolation mechanism 8 being arranged in the relief portion 570.

[0240] According to the working machine 1 of item 2-18, since at least a part of the vibration isolation mechanism 8 is arranged in the relief portion 570, the step 57 is not sandwiched between the vibration isolation mechanism 8 and the protection device support portion 711a, and the vibration isolation mechanism 8 can be arranged between the protection device support portion 711a and the driver's seat protection device 54, and the function of the vibration isolation mechanism 8 can be fully and properly exerted.

[0241] (Item 2-19) The device support 56 is mounted on the front portion of the base plate 55, the working device 3(3a) is attached to the device support 56 so as to be swingable in the vertical direction, the support member 71 supports the front portion of the driver's seat protection device 54, and the front end portion of the driver's seat protection device 54 is arranged at a position where it projects vertically and overlaps with the device support 56. The working machine 1 according to any one of items 2-1 to 2-18.

[0242] According to the working machine 1 of item 2-19, the support member 71 supports the front portion of the driver's seat protection device 54 Since the front end of the driver's seat protection device 54 is disposed at a position that projects vertically and overlaps with the device support 56, the load on the front end of the driver's seat protection device 54 is transmitted to the device support 56 via the support member 71. That is, the rigid device support 56 that supports the working device 3(3a) reliably supports the driver's seat protection device 54.

[0243] (Item 2-20) The device support 56 includes a main body 560 and a pair of legs 561, 561 that extend rearward from the main body 560 and are supported by the base plate 55. The installation surface 564 is provided in a region between the legs 561, 561 in the main body 560. The working machine 1 according to Item 2-3.

[0244] According to the working machine 1 of Item 2-20, since the installation surface 564 is provided in a region between a pair of legs 561, 561 that extend rearward from the main body 560, even if the support member 71 protrudes from the installation surface 564 rearward in the front-rear direction while being disposed on the installation surface 564, there are no legs 561, 561 on the lower side, and interference between the support member 71 and the legs 561 is prevented.

[0245] (Item 2-21) The device support 56 is made of cast iron, and the installation surface 564 is formed by machining the upper surface of the device support 56. The working machine 1 according to Item 2-20.

[0246] According to the working machine 1 of Item 2-21, since the entire device support 56 is integrally formed of cast iron, sufficient strength is obtained, and the flatness of the installation surface 564 is improved by machining. Therefore, the position and posture of the support member 71 can be made appropriate. Accordingly, the driver's seat protection device 54 can be properly supported with the required strength.

[0247] (Item 2-22) The driver's seat protection device 54 is a cabin including a wall portion covering the front, rear, left, and right of the driver's seat 50 and a roof 540 covering above the driver's seat 50, or a canopy having a plurality of columns 590L, 590R, 591L, 591R erected around the driver's seat 50 and a roof 540 supported above the driver's seat 50 by the columns 590L, 590R, 591L, 591R. The working machine 1 according to item 2-5 or item 2-18.

[0248] According to the working machine 1 of item 2-22 above, the cabin or canopy can be arranged at a position where it does not interfere with the working device 3 (3a), and even in such an arrangement, the workability of assembly, maintenance, etc. will not be reduced.

[0249] (Item 3-1) A traveling device 2, a base plate 55 supported by the traveling device 2 and capable of turning about an axis extending in the vertical direction with the turning center CL, support members 71, 72, 73 erected on the base plate 55, and equipment parts 57, 40, 61 supported by the support members 71, 72, 73, 74. The support members 71, 72, 73, 74 are attached to the base plate 55 by screw members B2, B3, B4. The working machine 1.

[0250] According to the working machine 1 of item 3-1, since the support members 71, 72, 73, 74 that support the equipment parts 57, 40, 61 are attached to the base plate 55 via the screw members B2, B3, B4, the support members 71, 72, 73, 74 can be attached and detached by attaching and detaching the screw members B2, B3, B4 during assembly or maintenance. As a result, the assembly and maintenance work becomes easier.

[0251] In addition, since the arrangements of the screw members B2, B3, and B4 are constant, the support members 71, 72, 73, and 74 are attached to the screw members B2, B3, and B4 in a fixed position and with a fixed posture. Further, since the support members 71, 72, 73, and 74 and the base plate 55 are not affected by heat such as fixation by welding, no distortion or the like occurs, and the support members 71, 72, 73, and 74 and the base plate 55 are fixed to each other. As a result, the support members 71, 72, 73, and 74 are fixed to the swivel base 52 in an appropriate posture and form, so that the equipment parts 57, 40, and 61 can be supported in an appropriate state. If there is distortion or the like in the shape of the support members 71, 72, 73, and 74, it can be removed from the base plate 55 and corrected, so it can be corrected much more easily than when integrated with the swivel base 52 that is affected by the surrounding environment (situation). Therefore, according to the working machine 1 of item 3-1, the equipment parts 57, 40, and 61 arranged at intervals with respect to the swivel base 52 can be arranged at appropriate positions without performing complicated work.

[0252] (Item 3-2) The support members 71, 72, 73, and 74 include fixing portions 720, 730, and 740 fixed to the base plate 55 by the screw members B2, B3, and B4 in a state of being arranged on the base plate 55, and upright portions 721, 731, and 741 having lower ends connected to the fixing portions 720, 730, and 740 and extending upward. The working machine 1 according to item 3-1, wherein the upright portions 721, 731, and 741 directly or indirectly support the equipment parts 57, 40, and 61 at upper ends of the upright portions 721, 731, and 741.

[0253] According to the working machine 1 of Item 3-2, the fixing parts 720, 730, and 740 are fixed to the base plate 55 via the screw members B2, B3, and B4, so that the entire support members 72, 73, and 74 can be attached to the base plate 55. Further, the upright parts 721, 731, and 741 extend upward and directly or indirectly support the equipment parts 57, 40, and 61 at the upper ends, so that the equipment parts 57, 40, and 61 can be arranged at positions corresponding to the heights of the upright parts 721, 731, and 741. That is, the equipment parts 57, 40, and 61 are arranged at positions separated from the base plate 55 by a distance corresponding to the heights of the upright parts 721, 731, and 741. Thereby, another equipment part 57, 40, or 61 can be arranged between the equipment parts 57, 40, and 61 and the base plate 55.

[0254] (Item 3-3) The support member 73 includes a pair of fixing parts 730, 730 fixed to the base plate 55 by the screw member B3 while being spaced apart on the base plate 55, a pair of upright parts 731, 731 having lower ends respectively connected to the pair of fixing parts 730, 730, and a connecting part 732 connecting the upper ends of the pair of upright parts 731, 731. The working machine 1 according to Item 3-1, wherein the equipment parts 40 and 61 are installed on the upper surface of the connecting part 732.

[0255] According to the working machine 1 of Item 3-3, when the pair of fixing parts 730, 730 are fixed to the base plate 55 with the screw member B3, the upper and lower ends of the pair of upright parts 731, 731 whose upper ends are connected via the connecting part 732 do not move away from each other, and the entire support member 73 is installed (arranged) in a stable state. Further, when the equipment parts 40 and 61 are installed on the upper surface (installation surface) 733 of the connecting part 732 that connects the upper ends of the pair of upright parts 731, 731, the pair of upright parts 731, 731 disperse and receive the load of the equipment parts 40 and 61, so it is optimal for supporting the heavy equipment parts 40 and 61.

[0256] (Item 3-4) The standing portions 721 and 741 are rod-shaped support columns extending in the vertical direction, and the work machine 1 described in Item 3-2 in which the equipment parts 57, 40, and 61 are installed on the upper end surfaces of the support columns 721 and 741.

[0257] According to the work machine 1 of Item 3-4, since the standing portions 721 and 741 are rod-shaped support columns and the equipment parts 57, 40, and 61 are installed on the upper end surfaces of the support columns 721 and 741, the weight of the equipment parts 57, 40, and 61 acts in the axial direction on the support columns 721 and 741. As a result, the weight (load) of the equipment parts 57, 40, and 61 does not act as an eccentric load on the support members 72 and 74, and the equipment parts 57, 40, and 61 can be stably supported.

[0258] (Item 3-5) The support members 72 and 74 have protruding portions 722 and 742 protruding downward from the lower surfaces of the fixing portions 720 and 740, and the base plate 55 has positioning holes H6 and H10 at the arrangement positions of the support members 72 and 74 into which the protruding portions 722 and 742 can be inserted and removed. The work machine 1 described in any one of Items 3-2 to 3-4.

[0259] According to the work machine 1 of Item 3-5, when the protruding portions 722 and 742 of the support members 72 and 74 are inserted into the positioning holes H6 and H10 in the base plate 55, the support members 72 and 74 are arranged in a posture in which the centers of the protruding portions 722 and 742 (protrusion directions) coincide with the centers of the positioning holes H6 and H10 (centers of holes S9 and S11). That is, the support members 72 and 74 are arranged in a positioned state at a predetermined position and in a predetermined posture. As a result, when the fixing portions 720 and 740 are fixed to the base plate 55 via the screw members B2 and B4, the support members 72 and 74 are fixed to the base plate 55 in an appropriate state, so that the equipment parts 57, 40, and 61 can be supported in an appropriate state.

[0260] (Item 3-6) The fixing parts 720 and 740 have through-holes H5 and H9 through which the lower parts of the support columns 721 and 741 are inserted. The support columns 721 and 741 are inserted into the through-holes H5 and H9 and fixed to the fixing parts 720 and 740 with their lower ends protruding downward from the fixing parts 720 and 740. The base plate 55 has positioning holes H6 and H10 at the positions where the support members 72 and 74 are arranged, into which the lower ends of the support columns 721 and 741 can be inserted and removed, for the working machine 1 described in item 3-4.

[0261] According to the working machine 1 of item 3-6, since the lower parts of the support columns 721 and 741 are inserted into the through-holes H5 and H9 of the fixing parts 720 and 740 and protrude downward from the fixing parts 720 and 740, the parts protruding downward from the fixing parts 720 and 740 are concentric with the support columns 721 and 741 on the upper side of the fixing parts 720 and 740. When the lower ends of the support columns 721 and 741 are fitted into the positioning holes H6 and H10, the support members 72 and 74 are arranged in a positioned state at a predetermined position and in a predetermined posture. Thereby, when the fixing parts 720 and 740 are fixed to the base plate 55 via the screw members B2 and B4, the support members 72 and 74 are fixed to the base plate 55 in an appropriate state, so that the equipment parts 57, 40, and 61 can be supported in an appropriate state.

[0262] (Item 3-7) The working machine 1 according to any one of items 3-2 to 3-4, which is provided with support convex portions 520, 521, and 522 protruding upward from the upper surface of the base plate 55 at the arrangement positions where the fixing parts 720, 730, and 740 of the support members on the base plate 55 are arranged, and the fixing parts 720, 730, and 740 are placed and fixed on the upper surfaces of the support convex portions 520, 521, and 522.

[0263] According to the working machine 1 of item 3-7, when arranging the support members 72, 73, and 74 on the base plate 55, the support convex portions Since they overlap with 520, 521, and 522, the arrangement and posture of the support members 72, 73, and 74 become even more appropriate. Further, since the support convex portions 520, 521, and 522 protrude from the base plate 55, when enhancing the flatness of the surface on which the support members 72, 73, and 74 are installed in order to improve the installation accuracy of the support members 72, 73, and 74, it is not necessary to machine the entire upper surface of the base plate 55. Instead, machining in a small range such as the upper surfaces of the support convex portions 520, 521, and 522 that protrude partially suffices, thereby increasing the machining efficiency.

[0264] (Item 3-8) The fixing portions 720, 730, and 740 have through holes H7, H8, and H11 that penetrate in the vertical direction and through which the screw members B2, B3, and B4 are inserted. The support convex portions 520, 521, and 522 have holes S9, S10, and S11 through which the screw members B2, B3, and B4 inserted through the through holes H7, H8, and H11 are inserted or screwed. The working machine 1 according to Item 3-7.

[0265] According to the working machine 1 of Item 3-8, since the common screw members B2, B3, and B4 pass through the holes S9, S10, and S11 of the support convex portions 520, 521, and 522 and the through holes H7, H8, and H11 of the fixing portions 720, 730, and 740, it is possible to prevent the support members 72, 73, and 74 from tilting due to the fastening force of the screw members B2, B3, and B4. That is, since the fixing portions 720, 730, and 740 are fixed by the screw members B2, B3, and B4 within the region where the support members 72, 73, and 74 are in planar contact with the support convex portions 520, 521, and 522, it is possible to prevent the support members 72, 73, and 74 from tilting with the outer periphery (edge) of the support convex portions 520, 521, and 522 as a fulcrum. As a result, the support members 71, 73, and 74 can be set in an appropriate posture.

[0266] (Item 3-9) The installation surface of the fixing portions 720, 730, and 740 on the support convex portions 520, 521, and 522, and the surface to be installed on the installation surfaces 520a, 521a of the fixing portions 720, 730, and 740 are machined flat surfaces. The working machine 1 according to Item 3-7.

[0267] According to the working machine 1 of Items 3-9, since the flatness of each of the installation surfaces 520a and 521a and the surface to be installed that are in surface contact with each other is improved, the posture and the like in the state where the support members 72, 73, and 74 are arranged become appropriate.

[0268] Note that the present invention is not limited to the above-described embodiment, and it goes without saying that appropriate changes can be made without departing from the gist of the present invention.

[0269] For example, in the above-described embodiment, as an example of the working machine 1, an excavator has been described, but the working machine 1 is not limited to an excavator. The working machine 1 may be other construction machines, agricultural machines, UVs (utility vehicles), or the like. More specifically, the working machine 1 may be a tractor, a skid steer loader, a wheel loader, or the like.

[0270] In the above-described embodiment, the working machine 1 includes, as the driver's seat protection device 54, a cabin that defines a driver's cab DR (a space having specified dimensions in the lateral direction, the longitudinal direction, and the height direction) including the driver's seat 50, but is not limited thereto. For example, as shown in FIG. 35, the working machine 1 may include a plurality of columns 590L, 590R, 591L, and 591R erected around the driver's seat 50 and a roof 540 supported above the driver's seat 50 by the columns 590L, 590R, 591L, and 591R, that is, a so-called canopy. Note that the frame 59 of the canopy is different in appearance (design) from the frame 59 of the cabin 54, but is common in structure, so the description of the frame 59 of the cabin 54 in the above-described embodiment can be read as the description of the frame of the canopy. Accordingly, in FIG. 35, the same reference numerals as those in the above-described embodiment are given to the configurations corresponding to or common to the frame of the cabin 54.

Description of Reference Numerals

[0271] 1: Working machine 2: Traveling device 3: Working device 4: Internal combustion engine (prime mover) 5: Machine body 8: Vibration damping mechanism 9: Partition wall 40: Fuel tank (equipment part) 50: Driver's seat 52: Swivel base 53: Swivel bearing 54: Cabin (driver's seat protection device) 55: Base plate 56: Device support 57: Step (equipment part) 59: Frame 60: Hydraulic pump 61: Hydraulic oil tank (equipment part) 71: Second support member (support member) 72: Third support member (support member) 73: Fourth support member (support member) 74: Fifth support member (support member) 80: Elastic member 90: First metal plate (metal plate) 91: Second metal plate (metal plate) 92: Sound-absorbing material 93: Inspection port 93a: First opening 93b: Second opening 94: Closing member 94a: First closing plate 94b: Second closing plate 95: Sealing member 96: Spacing maintaining member 97: Sound-absorbing material 520: Support projection 520a: Installation surface 521: Support projection 521a: Installation surface 522: Support projection 540: Roof 541: Front window (exterior member) 542: Rear window (exterior member) 543: Entrance / exit door (exterior member) 544: Side window (exterior member) 562: Device connection part 570: Relief part (relief hole) 710: Base part 711: Support main body part 711a: Protection device support part 711b: Step support part 720: Base (fixed part) 721: Column part (standing part) 722: Protruding part 730: Fixed part 731: Standing part 732: Connection part 740: Base (fixed part) 741: Column part (standing part) 742: Protruding part 910: Support part CA: Annular region DR: Driver's cab

Claims

1. The aircraft and A traveling device that supports the machine body so that it can travel; A working device attached to the machine body; Equipped with The airframe comprises: A base plate supported by the traveling device and rotatable about an axis extending in the vertical direction; an apparatus support attached to the base plate and supporting the working apparatus; A driver's seat disposed on the base plate; A driver's seat protection device for protecting the driver's seat; Equipped with A support member for supporting the driver's seat protection device is removably attached to the device support body.

2. A swivel bearing is provided that is supported by the traveling device. the base plate is fixed to the slewing bearing via a plurality of male screw members arranged within an annular region that overlaps with the slewing bearing in a vertical direction; The work machine described in claim 1, wherein the support member has a base portion attached to the device support at a position that is not projected to overlap the male screw member in the vertical direction, and a support main body portion connected to the base portion and positioned at a position that at least a portion of the support main body portion is projected to overlap the male screw member in the vertical direction, and a protection device support portion that supports the driver's seat protection device is provided on the support main body portion.

3. The device support has a planar installation surface on an upper surface thereof on which the support member is installed, the base portion is disposed on the installation surface and fixed to the device support by a screw member; The work machine according to claim 2 , wherein the protection device support portion is provided at a position that is not overlapped with the installation surface in a vertical direction on at least one of the base portion and the support main body portion.

4. The screw member has a head and a threaded portion having a diameter smaller than that of the head, the base portion has a through hole through which the screw portion is inserted, A screw hole into which the screw portion is screwed is formed on the installation surface, the support body is disposed in an area of ​​the upper surface of the base portion avoiding the through hole and is connected to the base portion; 4. The work machine according to claim 3, wherein the thickness of the support body in the vertical direction is set to be greater than the height of the head.

5. A vibration isolation mechanism is provided for supporting the driver's seat protection device in a vibration isolation manner, The work machine according to claim 2 , wherein the vibration isolation mechanism is interposed between the protection device support portion and the driver's seat protection device.

6. A step is provided which is a floor plate supporting the driver's seat, The work machine according to claim 2 , wherein the support member comprises: the protection device support portion; and a step support portion that supports the step.

7. The step is fixed in a state in which it is placed on the step support, The support member is provided with either one of the base portion or the support body portion and the step support.

7. The work machine according to claim 6, further comprising a support connecting portion that connects the step support portion to the step support portion and supports the step support portion at a predetermined position, the support connecting portion being elastically deformable at least in a direction intersecting with the up-down direction.

8. The work machine according to claim 7 , further comprising a male screw member for fixing the step to the step support portion, the male screw member being inserted vertically through the step and screwed into the step support portion.

9. The support connection portion is a support extension portion connected to either the base portion or the support main body portion and extending in a vertical direction from the either one; A work machine as described in claim 7, including a support arm extending from the support extension portion in a direction intersecting the vertical direction, the support arm being connected to the step support portion, and at least one of the support extension portion and the support arm portion being elastically deformable at least in a direction intersecting the vertical direction.

10. The work machine according to claim 9 , wherein the support extension portion hangs down from either the base portion or the support body portion.

11. The support extension is elastically deformable in a direction perpendicular to the up-down direction, The work machine according to claim 9 , wherein the support arm is elastically deformable in a direction perpendicular to the direction in which the support arm extends.

12. The support extension portion and the support arm portion are formed in a band plate shape, The support extension depends in a longitudinal direction, The work machine according to claim 9 , wherein the support arm extends in a longitudinal direction.

13. The work machine according to claim 12, wherein the support extension and the support arm are integrally formed by bending a metal strip.

14. The work machine according to claim 9 , wherein the support arm portion extends at an angle of 45° or less with respect to an imaginary line extending in a direction perpendicular to each of the front-rear direction and the up-down direction of the base plate.

15. The work machine according to claim 14, wherein the support arm portion extends in a direction along which an imaginary tangent to an imaginary circle having the rotation center as its center extends.

16. The work machine according to claim 9 , wherein the step support portion extends in the vertical direction and has a lower end portion connected to the support arm portion, and an upper end portion opposite the lower end portion, the upper end portion supporting the step.

17. The protection device support portion and the step support portion are provided on an upper surface of the support body portion, The step has a hole-like or notched relief portion provided at a position corresponding to the protection device support portion, The work machine according to claim 6, wherein the driver's seat protection device is supported directly or indirectly by the protection device support portion via the relief portion.

18. A vibration isolation mechanism is provided for supporting the driver's seat protection device in a vibration isolation manner, The work machine according to claim 17, wherein at least a portion of the vibration isolation mechanism is disposed in the relief portion.

19. the device support is mounted to a front portion of the base plate; The working device is attached to the device support so as to be swingable in the up and down direction, The support member supports a front portion of the driver's seat protection device, The work machine according to claim 1 , wherein the driver's seat protection device is disposed at a position where a front end portion thereof overlaps with the device support body in a vertical direction.

20. The device support includes a main body and a pair of legs extending rearward from the main body and supported by the base plate, The work machine according to claim 3 , wherein the installation surface is provided in an area between the legs of the main body.

21. 21. The work machine of claim 20, wherein the equipment support is made of cast iron, and the mounting surface is formed by machining an upper surface of the equipment support.

22. The work machine according to claim 5 or 18, wherein the driver's seat protection device is a cabin having walls covering the front, rear, left and right sides of the driver's seat and a roof covering above the driver's seat, or a canopy having a plurality of pillars erected around the driver's seat and a roof supported above the driver's seat by the pillars.

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