Work equipment

Abstract

To provide an efficient heating system for motorizing a work machine.SOLUTION: The work machine includes a machine body, a work device provided on the machine body, an operation room structure mounted on the machine body, the operation room structure having an operation room and a floor surface body constituting the floor surface of the operation room, and the heating system for heating the inside of the operation room, the heating system having a heat generation part for generating heat with electric power, and a hot water circulation part for circulating water hotted by the heat generation of the heat generation part, at least the heat generation part of the heating system being arranged in a space in the machine body below the floor surface body.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a work machine such as an excavation machine. [Background technology]

[0002] The work vehicle disclosed in Patent Document 1 includes an engine and a driving cab in the vehicle body, and a lower hot water heater that circulates hot water using a pump driven by the engine as a heating device for the driving cab. The lower hot water heater is located at the foot of the driver's seat in the driving cab.

[0003] Furthermore, the body of the work vehicle of Patent Document 1 is rotatably mounted with an upper rotating work machine including a work implement, and is equipped with an upper hot water heater that circulates hot water using a pump driven by an electric motor as a heating device for the work cab provided on the upper rotating work machine. The upper hot water heater is located at the foot of the driver's seat in the work cab.

[0004] It should be noted that both the upper hot water heater and the lower hot water heater disclosed in Patent Document 1 use engine cooling water as the hot water, that is, the heat source is the exhaust heat of the engine.

[0005] Furthermore, the passenger car type vehicle disclosed in Patent Document 2 has an electric hot water heater installed on the floor of the passenger compartment and in the space under the seat. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-048685 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-226970 Summary of the Invention [Problem to be solved by the invention]

[0007] In recent years, there has been a demand for excavation machines (e.g., backhoes) and other work machines to be equipped with prime movers that do not use combustion-based energy. In such cases, the heating device for the operation room, such as a cabin, provided on the work machine must not rely on engine exhaust heat, so it is desirable to use an electric hot water heater such as that described in Patent Document 2.

[0008] To reduce costs, the challenge is to provide an efficient heating system for the operator's compartment of a work machine using an electric hot water heater, which has a limited heat generation capacity. In the operator's compartment of a work machine such as a backhoe, it may not be possible to secure effective installation space in the foot area or under the seat, as shown in Patent Documents 1 and 2. Furthermore, the locations (particularly vertical locations) of the gas-liquid separation tank and water supply port connected to the hot water circulation path are limited to ensure ease of water filling, inspection, and other operations. However, these locations depend on the locations (particularly vertical locations) of the main body, including the heat generating unit and pump. Consequently, the layout of the main body, including the heat generating unit, of the electric hot water heater is an important issue.

[0009] SUMMARY OF THE INVENTION An object of the present invention is to provide a work machine that can solve the above-mentioned problems. [Means for solving the problem]

[0010] A working machine according to one aspect of the present invention includes a machine body, a working device provided on the machine body, an operation room structure mounted on the machine body, the operation room structure having a floor body that forms a floor surface of the operation room, a heating device for heating the inside of the operation room, an operating member for adjusting the room temperature disposed in the operating room; The heating device has a heat generating section that generates heat using electric power and a hot water circulating section that circulates water heated by the heat generated by the heat generating section. At least the heat generating section of the heating device is disposed in a space within the machine body below the floor body. The hot water circulation unit has an electrically driven pump for discharging hot water, and the operating member also serves as an operating member for simultaneously setting the heating unit and the pump to an energized state and simultaneously setting them to an unenergized state. [Effects of the Invention]

[0011] The work machine having the above-described configuration can provide an efficient heating effect for the operation room and can provide a layout of the heating device that is effective in increasing the degree of freedom in arranging various devices. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a left front perspective view of a swing-type excavation work machine (hereinafter simply referred to as "work machine") that is one embodiment of the work machine. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 2 is a perspective view showing the left front portion of the body of the work machine. [Figure 6] FIG. 2 is a perspective view of the left front portion of the aircraft with a lower side cover removed. [Figure 7] FIG. 2 is an internal side view of the fuselage showing the structure of the heating device. [Figure 8] FIG. 2 is a front view of the interior of the fuselage showing the structure of the cabin bottom. [Figure 9] FIG. 2 is an internal plan view of the fuselage showing the structure of the cabin bottom. [Figure 10] FIG. 2 is an internal plan view of the aircraft showing the structure of the cabin bottom with the seats removed. [Figure 11] FIG. 2 is a plan view of the interior of the fuselage with the cabin bottom removed. [Figure 12] FIG. 2 is an enlarged plan view of the area around the seat in the cabin, showing a temperature control dial and the like. [Figure 13] FIG. 2 is a partial side view of the aircraft body with an inspection door open. [Figure 14] FIG. 2 is an exploded perspective view of the left rear of the fuselage with a plurality of covers removed. [Figure 15] FIG. 2 is an exploded perspective view of the right rear of the fuselage with a plurality of covers removed. [Figure 16]FIG. 2 is a right rear perspective view of the vehicle body with a bonnet side cover open. [Figure 17] FIG. 2 is a right front perspective view showing the arrangement of electrical equipment inside the rear bonnet. [Figure 18] FIG. 3 is a control block diagram of electronic devices related to a heating device in the work machine. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of a work machine will be described with reference to the drawings. Figures 1 to 4 etc. show a swing-type excavation machine 1, which is an example of a work machine. Hereinafter, this will be simply referred to as work machine 1.

[0014] The overall configuration of the work machine 1 will be described with reference to Figures 1 to 4 etc. The work machine 1 comprises a traveling body 10, a swivel base 20 which is an example of a machine body, and a working device 30. Hereinafter, the swivel base 20 will be referred to as the machine body 20.

[0015] The machine body 20 is mounted on the upper part of the running body 10 via a vertical pivot shaft (not shown). As shown in Fig. 2, the machine body 20 is mounted so as to be rotatable in the horizontal direction relative to the running body 10 around the vertical axis X of the pivot shaft.

[0016] In the following description of the work machine 1, the front-to-rear direction refers to the front-to-rear direction of the machine body 20, regardless of the relative rotational position of the traveling body 10 with respect to the machine body 20. In some of the drawings among Figs. 1 to 16, an arrow F extends toward the front of the machine body 20. This direction coincides with the horizontal line of sight of an operator seated in a driver's seat 44 (described later) facing forward. For the machine body 20, the rear is the horizontal direction directly opposite to the arrow F.

[0017] In the following description of the work machine 1, the left and right direction refers to the left and right direction of the machine body 20 (the width direction of the machine body 20) regardless of the relative rotational position of the traveling body 10 with respect to the machine body 20. In some of Figures 1 to 16, arrow L extends to the left of the machine body 20.

[0018] When illustrated with arrow F, arrow L extends from the origin of arrow F in the left direction with respect to arrow F. The direction of arrow L corresponds to the horizontal left direction with respect to an operator sitting in a driver's seat 44, which will be described later. With respect to the aircraft 20, the right direction is the horizontal direction directly opposite to that of arrow L.

[0019] Hereinafter, when the position or direction of each component or part of the work machine 1 is described, it will be assumed that the position or direction is relative to the machine body 20 as described above.

[0020] The running body 10 will be described assuming that the front-to-rear direction of the running body 10 coincides with the front-to-rear direction of the machine body 20. As shown in Figures 2, 4, etc., the running body 10 has a running frame 11, a left running device 12L provided on the left side of the running frame 11, and a right running device 12R provided on the right side of the running frame 11. Hereinafter, the left running device 12L and the right running device 12R will each be referred to as the running device 12.

[0021] As shown in Figure 2 etc., the running device 12 is a crawler-type running device having a running motor 13, rear wheels 14 as drive sprockets, front wheels 15 as driven wheels, multiple rollers 12a arranged between the rear wheels 14 and the front wheels 15, and crawlers 16 wound around the rear wheels 14, front wheels 15 and rollers 12a.

[0022] The traveling device 12 may be configured differently from a crawler-type traveling device, for example, a tire-type traveling device that does not have crawlers and has tires as front and rear wheels.

[0023] The traveling motor 13 is mounted coaxially with the central axis of rotation of the rear wheel 14, which serves as a drive sprocket, and its output shaft extends to serve as the central axis of rotation of the rear wheel 14. The output shaft of the traveling motor 13 may be interlocked with the central axis of rotation of the drive sprocket via a transmission mechanism such as a reduction gear train. Alternatively, the front wheel of the traveling device 12 may serve as the drive sprocket, and the output shaft of the traveling motor 13 may be interlocked with the rotation shaft of the front wheel.

[0024] The travel motor 13 is a hydraulic motor, and its rotational power is the hydraulic pressure of the working oil discharged from each of a pair of hydraulic pumps (not shown) driven by the output of an electric motor 92 that serves as the prime mover of the work machine 1, as described below.

[0025] Referring to FIG. 4, the travel motor 13L of the left traveling device 12L (hereinafter referred to as the "left traveling motor") and the travel motor 13R of the right traveling device 12R (hereinafter referred to as the "right traveling motor") can be controlled in their rotation speeds and rotation directions independently of each other.

[0026] If the left traveling motor 13L and the right traveling motor 13R have the same rotation speed and rotation direction, the traveling body 10 will move straight forward or backward (assuming that this direction coincides with the fore-and-aft direction of the machine body 20).

[0027] The running body 10 turns by setting a difference in rotation speed between the left traveling motor 13L and the right traveling motor 13R, stopping the rotation of only one of them, or rotating them in opposite directions. As long as the machine body 20 does not rotate relative to the running body 10 around the rotation axis 18a (described later), the machine body 20 turns together with the running body 10 while maintaining its relative position with respect to the running body 10.

[0028] The configuration of the aircraft body 20 will be described with reference to Figures 1 to 6, 14 to 16, etc. The aircraft body 20 has a horizontal plate-shaped platform 21, lower side covers 22 erected along the peripheral edge of the platform 21, bonnet side covers 23 disposed above the lower side covers 22, a bonnet top cover 24 provided at the upper end of the bonnet side covers 23, a bonnet center cover 25 disposed along the front end edges of the bonnet side covers 23 and the bonnet top cover 24, a partition plate 26 interposed between the lower end of the bonnet center cover 25 and the upper surface of the platform 21, etc.

[0029] The lower side cover 22 is erected in a generally horizontal band shape over the entire peripheral area of ​​the platform 21, and defines the front, rear, left and right end faces of the lower part of the fuselage 20. The lower side cover 22 is made up of a plurality of cover members connected in the front-to-rear and left-to-right directions with their upper and lower ends aligned generally flush with each other.

[0030] The multiple cover members of the lower side cover 22 include a front cover member 22a, a front left side cover member 22b, a rear left side cover member 22c, a rear cover member 22d, a rear right side cover member 22e, and a front right side cover member 22f.

[0031] 5 and other figures, at the front end of the aircraft body 20, a front cover member 22a extends in the left-right direction along the front edge of the platform 21. At the left end of the aircraft body 20, a front left side cover member 22b extends in the front-rear direction along the left edge of the front half of the platform 21, and its front end is connected to the left end of the front cover member 22a. In addition, a rear left side cover member 22c extends in the front-rear direction along the left edge of the rear half of the platform 21, and its front end is connected to the rear end of the front left side cover member 22b.

[0032] 4 and other figures, at the rear end of the fuselage 20, the rear end of the rear left side cover member 22c curves along the left rear corner of the platform 21 and extends to the right along the rear edge of the platform 21. Meanwhile, a rear right side cover member 22e is erected along the right rear corner of the platform 21, substantially symmetrically to the rear left side cover member 22c, and extends to the left along the rear edge of the platform 21.

[0033] In addition, along the rear edge of the platform 21, a rear cover member 22d is interposed between the rear left side cover member 22c and the rear right side cover member 22e, and these cover members 22c, 22d, 22e are joined together when they are adjacent to each other.

[0034] 15, 16, etc., at the right end of the aircraft body 20, a rear right side cover member 22e curves along the right rear corner of the platform 21, extending forward, with its front end located at the midpoint between the front and rear of the right edge of the platform 21. In addition, a front right side cover member 22f extends in the front-to-rear direction along the portion from the front end of the right edge of the platform to the midpoint between the front and rear of the platform, in a manner generally symmetrical to the front left side cover member 22b on the left side of the aircraft body 20. The rear end of the front right side cover member 22f is joined to the front end of the rear right side cover member 22e.

[0035] The bonnet side covers 23 are erected on the upper edges of the lower side covers 22 erected on the peripheral edge of the platform 21, and form the upper layer of the aircraft body 20. As will be described later, a cabin 40 is erected on the aircraft body 20, and the bonnet side covers 23 form a rear bonnet 20a behind the cabin 40 and a side bonnet 20b on the right side of the cabin 40, as shown in FIG.

[0036] The bonnet side cover 23 is made up of multiple cover members connected in the front, rear, left and right directions with their upper ends aligned substantially flush with one another. The multiple cover members of the bonnet side cover 23 include a left side cover member 23a, a rear side cover member 23b, a rear right side cover member 23c, and a front right side cover member 23d.

[0037] 1 to 6, 13, etc., the rear left side cover member 23a of the bonnet side cover 23 is curved in plan view in the same manner as the rear left side cover member 22c of the lower side cover 22. From the rear half of the left end of the fuselage 20 to the rear left end, the lower edge of the left side cover member 23a is joined to the upper edge of the rear left side cover member 22c, and the left side cover member 23a is erected on the rear left side cover member 22c.

[0038] As shown in Figure 4, etc., the right end of the rear part of left side cover member 23a is disposed flush with the right end of the rear part of rear left side cover member 22c. As shown in Figures 1 and 2, etc., the front end part of left side cover member 23a extends forward beyond the front end of rear left side cover member 22c and hangs over the rear part of front left side cover member 22b.

[0039] 4, 14, etc., at the rear end of the aircraft body 20, the lower edge of the rear cover member 23b of the bonnet side cover 23 is joined to the upper edge of the rear cover member 22d of the lower side cover 22, and the rear cover member 23b is erected on the rear cover member 22d. The left ends and right ends of the rear cover member 23b and the rear cover member 22d are flush with each other, and the left edge of the rear cover member 23b is joined to the right edge of the rear part of the left side cover member 23a.

[0040] The bonnet top cover 24 is arranged so as to cover the opening defined by the upper edge of the left side cover member 23a and the upper edge of the rear cover member 23b of the bonnet side cover 23 thus erected on the lower side cover 22. The bonnet top cover 24 is arranged so that its left edge is joined to the upper edge of the left side cover member 23a of the bonnet side cover 23 and its rear edge is joined to the upper edge of the rear cover member 23b of the bonnet side cover 23, defining a horizontal plane at the top end of the rear bonnet 20a.

[0041] As shown in FIG. 16 and other figures, the right end of the bonnet top cover 24 is disposed flush with the right ends of the rear cover member 22d and the rear cover member 23b.

[0042] As shown in Figures 3, 4, and 15, the rear right side surface cover member 23c of the bonnet side cover 23 is integrally formed with a side plate portion 23c1 that is curved in a generally vertical plate shape in a plan view similar to the rear right side surface cover member 22e of the lower side cover 22, and an upper plate portion 23c2 that extends in a generally horizontal direction from the upper end of this side plate portion.

[0043] From the rear half of the right end of the fuselage 20 to the rear right end, the lower edge of the side plate portion 23c1 of the rear right side cover member 23c is joined to the upper edge of the rear right side cover member 22e, and the rear right side cover member 23c is erected on the rear right side cover member 22e.

[0044] As shown in Figure 15 and other figures, the front end of rear right side cover member 23c is flush with the front end of rear right side cover member 22e. As shown in Figures 3, 4, 15 and other figures, the left end of side plate portion 23c1 at the rear end of rear right side cover member 23c is flush with the left end of the rear part of rear right side cover member 22e. The left edge of side plate portion 23c1 of rear right side cover member 23c is joined to the right edge of rear cover member 23b, which is erected on rear cover member 22d.

[0045] Additionally, the left edge of the upper plate portion 23c2 of the rear right side cover member 23c is joined to the right edge of the bonnet top cover 24. Thus, the upper surfaces of the bonnet top cover 24 and the upper plate portion 23c2 of the rear right side cover member 23c are flush with each other and adjacently arranged side by side, forming the upper end surface of the rear bonnet 20a.

[0046] Thus, at the rear of the fuselage 20, the left side cover member 23a, rear cover member 23b, rear right side cover member 23c of the bonnet side cover 23, and the bonnet top cover 24 form the rear bonnet 20a behind the cabin 40.

[0047] 15, 16, etc., the lower edge of the front right side cover member 23d of the hood side cover 23 is joined to the upper edge of the front right side cover member 23f of the lower side cover 22, and the rear edge of the front right side cover member 23d is joined to the front edge of the rear right side cover member 23c. Thus, at the right end of the body 20, the front right side cover member 23d is erected on the front right side cover member 23f.

[0048] 3, 15, 16, etc., the upper and front ends of the bonnet side cover 23 bulge out to the right, and the right end thereof contacts the right side surface of the cabin 40 mounted on the aircraft body 20 as described below. The rear end edge of the right bulging portion of the upper end of the bonnet side cover 23 is joined to the front end edge of the upper plate portion 23c2 of the rear right side surface cover member 23c. The bonnet side cover 23 having such a shape constitutes the right side bonnet 20b of the cabin 40.

[0049] 6 to 8, 17, etc., a vertical partition plate 26 is erected to extend in the left-right direction at a midpoint between the front and rear of the upper surface of the platform 21. The upper end of the partition plate 26 is located at approximately the same height as the upper end of the lower side cover 22. The left end of the partition plate 26 is connected to a midpoint between the front and rear of the lower side cover 22, more specifically, to a portion slightly forward of the rear end of the front left side cover member 22b, on the left side of the fuselage 20.

[0050] 1, 2, 5, etc., the front end of the left side surface cover member 23a of the bonnet side cover 23 is curved and rises up to its upper end at the left end of the vehicle body 20. As can be seen from Figures 7 to 9, etc., the bonnet center cover 25 has its lower end joined to the upper end of the partition plate 26 and its upper end joined to the front end of the bonnet top cover 24, and is provided so as to extend in an upward and rearward inclined manner along the front end of the bonnet side cover 23 on the left side of the vehicle body 20 in a side view.

[0051] As can be seen from Figures 6 to 8, the fuselage 20 has an internal space formed above the platform 21, surrounded by the lower side covers 22, the bonnet side covers 23, the bonnet top cover 24, the bonnet center cover 25, and the sides of the cabin.

[0052] Of this internal space, the front half space in front of the partition plate 26 is an underfloor room S1, and the rear half space behind the partition plate 26 and the bonnet center cover 25 is a rear bonnet room S2 formed by the rear bonnet 20a. Furthermore, on the right side of the cabin 40, a side bonnet room S3 is formed within a side bonnet 20b that extends forward from the right front part of the rear bonnet 20a.

[0053] The heights of the lower ends of the underfloor room S1 in front of the partition plate 26, the rear bonnet room S2 behind the partition plate 26, and the side bonnet room S3 in front of the partition plate 26 and of the cabin 40 are all determined by the upper surface of the platform 21 and are at a common height.

[0054] On the other hand, the upper ends of the rear bonnet chamber S2 and the side bonnet chamber S3 defined by the upper end of the bonnet side cover 23 are higher than the upper end of the underfloor chamber S1 defined by the upper end of the lower side cover 22 by the vertical width of the bonnet side cover 23.

[0055] 6 and 14 to 16, cover members 22a to 22f constituting the lower side cover 22, cover members 23a to 23d constituting the bonnet side cover 23, and bonnet top cover 24 can be individually removed, and removing these cover members opens up the underfloor compartment S1, rear bonnet compartment S2, and side bonnet compartment S3, making it possible to access the various devices provided in these compartments. Alternatively, each cover member may have a structure that can be opened and closed like an opening and closing door, as in the case of rear right side cover member 23c shown in FIG.

[0056] The lower side covers 22 and the hood side covers 23 that form the periphery of the fuselage 20 do not have to be configured by joining multiple cover members together. For example, some or all of the multiple cover members may be replaced with a single cover member that is integrally formed. Furthermore, each cover member may be non-detachably connected to the platform 21, an adjacent cover member, or the like.

[0057] 11, a vertically penetrating hole 21g is provided in the platform 21 in a portion that constitutes the bottom plate of the underfloor room S1. A rotation motor (not shown) is installed on the upper surface of the platform 21 near the hole 21g, and a rotation shaft that is linked to the output shaft of the motor passes through the hole 21g, hangs down below the platform 21, and is pivotally supported by the traveling frame 11 of the traveling body 10.

[0058] In this way, the swing motor is driven to swing the machine body 20 horizontally relative to the traveling body 10. The swing motor may be, for example, an electric motor or a hydraulic motor. If it is an electric motor, it may be driven by receiving a supply of electric power from a battery, which will be described later. On the other hand, if it is a hydraulic motor, it may be driven by oil discharged from a hydraulic pump, which is driven by an electric motor 92, which serves as a prime mover, which will be described later.

[0059] 1, 5, etc., an opening is provided in the lower side cover 22 at the right front portion of the fuselage 20. This opening is a gap between the right end of the front cover member 22a and the front end of the front right side cover member 22f. A bracket base 20a formed on the platform 21 protrudes forward through this gap beyond the front cover member 22a.

[0060] 3 and other figures, a swing bracket 31 is pivotally supported on the bracket base portion 21a via a vertical pivot 31a. A swing cylinder 32, which is a hydraulic actuator, is installed on the upper right surface of the platform 21 so as to extend in the approximately front-rear direction from the right side of the rear bonnet compartment S2 to the underfloor compartment S1.

[0061] The piston rod of the swing cylinder 32 protrudes forward through the gap between the front cover member 22a and the front right side cover member 22f, and is pivotally connected to the swing bracket 31. By the extension and contraction of this swing bracket 31, the swing bracket 31 can rotate relatively in the left-right direction with respect to the machine body 20 around the vertical axis of the pivot 31a.

[0062] 1 to 3, in this embodiment, the working device 30 is a backhoe-type excavation working device having a boom 33, an arm 34, and a bucket 35, which is a type of work attachment. Below, the working device 30 will be described assuming that the front-to-rear direction of the working device 30 coincides with the front-to-rear direction of the machine body 20 (a state in which the swing bracket 31 does not rotate left or right relative to the machine body 20).

[0063] The base end of the boom 33 is pivotally supported on the swing bracket 31, the base end of the arm 34 is pivotally supported on the tip end of the boom 33, and the bucket 35 is pivotally supported on the tip end of the arm 34. In this way, the boom 33 can rotate relative to the swing bracket 31, the arm 34 can rotate relative to the boom 33, and the bucket 35 can rotate relative to the arm 34 in the up-and-down or front-and-rear directions, respectively.

[0064] The working device 30 has hydraulic actuators: a boom cylinder 36, an arm cylinder 37, and a bucket cylinder 38. The boom 33 is bent midway in the front-to-back (or up-to-down) direction, and the boom cylinder 36 is interposed between the front of the swing bracket 31 and the bent portion of the boom 33, and the arm cylinder 37 is interposed between the bent portion of the boom 33 and the base end of the arm 34, and between the base end of the arm 34 and the bucket 35.

[0065] The boom 33 rotates relative to the swing bracket 31 due to the extension and retraction of the piston rod of the boom cylinder 36. The arm 34 rotates relative to the boom 33 due to the extension and retraction of the piston rod of the arm cylinder 37. The bucket 35 rotates relative to the arm 34 due to the extension and retraction of the piston rod of the bucket cylinder 38.

[0066] It should be noted that other hydraulic attachments can be attached to the tip of the arm 34 instead of or in addition to the bucket 35. Examples of such hydraulic attachments include a hydraulic breaker, a hydraulic crusher, an angle broom, an earth auger, a pallet fork, a sweeper, a mower, and a snow blower.

[0067] 1 to 3, assuming that the front-to-rear direction of the traveling body 10 coincides with the front-to-rear direction of the machine body 20, a dozer 17, which is a work device separate from the work device 30, is disposed in front of the traveling body 10. The dozer 17 has a blade 17a, a dozer arm 17b, and a dozer cylinder 18, which is a hydraulic actuator.

[0068] The blade 17a is disposed forward of the left and right traveling units 12L and 12R. The dozer arm 17b is disposed between the left traveling unit 12L and the right traveling unit 12R. The front end of the dozer arm 17b is fixed to the blade 17a, and the rear end is pivotally supported on the traveling frame 11 so as to be vertically rotatable.

[0069] The dozer cylinder 18 is interposed between the front-rear midpoint of the dozer arm 17b and the traveling frame 11. The dozer arm 17b and the blade 17a rotate up and down relative to the traveling frame 11 as the piston rod of the dozer cylinder 18 extends and retracts.

[0070] The layout of the devices in the internal space of the machine body 20 will be described with reference to FIGS. 6 to 8, 11, and 13 to 17.

[0071] 7, 14, 15, 17, etc., in the rear bonnet compartment S2, a support frame (arch) 29 is erected on the platform 21. The support frame 29 also serves as a frame that supports the rear bonnet 20a from the inside.

[0072] The support frame 29 supports a battery unit 90. The battery unit 90 is made up of a combination of multiple batteries, and in this embodiment, a pair of batteries 90a are arranged side by side on the left and right and connected together by a frame 90b.

[0073] As shown in Fig. 17, electrical equipment 97 including an inverter, converter, etc. are installed on the upper surface of the support frame 29 above the battery unit 90. Furthermore, as shown in Fig. 7, a sub-battery support frame 29a is provided on the rear left side of the support frame 29 so as to face the rear left side cover member 22c of the lower side cover 22. As shown in Figs. 14 and 15, the sub-battery 63 is supported by this sub-battery support frame 29a.

[0074] As shown in Figure 17, in the part of the rear bonnet compartment S2 that is surrounded by the rear right side cover member 22e of the lower side cover 22, a motor / pump assembly 91 is installed on the platform 21 to the right of the battery unit 90 (support frame 29).

[0075] The motor-pump assembly 91 includes a frame 91a, and an electric motor 92 and a hydraulic pump 93 supported by the frame 91a. The electric motor 92 and the hydraulic pump 93 are supported by the frame 91a so as to be arranged on the same axis as each other.

[0076] The electric motor 92 is provided as a prime mover for the work machine 1, and is driven by electric power supplied from a battery 90a of the battery unit 90. The hydraulic pump 93 is an axial piston pump, and an output shaft of the electric motor 92 extends and is inserted into the hydraulic pump 93 as a pump shaft, which is the rotating shaft of the hydraulic pump 93.

[0077] The motor-pump assembly 91 has an axis in the front-to-rear direction, and is installed on the upper surface of the platform 21 to the right of the battery unit 90 with an electric motor 92 and a hydraulic pump 93 arranged in parallel in the front and rear.

[0078] Also, as shown in Figure 16, a radiator 94 and an oil cooler (hydraulic oil cooler) 95 are arranged side by side in the front and rear directions above the motor-pump assembly 91 on the right side of the battery unit 90 (support frame 29).

[0079] The radiator 94 is for radiating heat from the cooling water that cools the battery unit 90, the motor-pump assembly 91, etc. The radiator 94 is equipped with an electric radiator fan 94a, and exhausts air that has been heated by the heat radiated from the cooling water.

[0080] The oil cooler 95 is for cooling the hydraulic oil discharged from the hydraulic pump 93 of the motor-pump assembly 91, which has become hot after being used to operate hydraulic equipment described below. The oil cooler 95 is equipped with an electric oil cooler fan 95a, which exhausts air heated by heat released from the hydraulic oil.

[0081] The radiator 94 and the oil cooler 95 are surrounded by a shroud 96, which extends to the right as a duct for sending out exhaust air from the radiator fan 94a and the oil cooler fan 95a. An exhaust port formed in the rear right side cover member 23c of the bonnet side cover 23 faces the right end opening of the shroud 96, and the exhaust air is released into the outside air through this exhaust port.

[0082] The electric radiator fan 94a and the electric oil cooler fan 95a can be switched on and off at the operator's discretion or automatically. Referring to Fig. 18, for example, a control device 100 may be provided at an appropriate position on the machine body 20 of the work machine 1, and a radiator fan switch 101 and an oil cooler fan switch 102 that can be operated at the operator's discretion may be provided in an operation room 41 (described later) or the like as input devices to the control device 100, so that the radiator fan 94a and the oil cooler fan 95a can be switched on and off by operating these switches.

[0083] As shown in Figures 8, 11, 17, etc., within the side bonnet chamber S3, which is covered by the front right side cover member 23d as the side bonnet 20b, a tank stand 21f is provided on the platform 21, and a hydraulic oil tank 61 is mounted on the tank stand 21f.

[0084] 11, a control valve unit 62 is installed in the underfloor room S1 at the front left part of the platform 21. The control valve unit 62 is made up of a combination of individual control valves for controlling the flow of hydraulic oil to each hydraulic actuator, such as the boom cylinder 36, arm cylinder 37, bucket cylinder 38 of the work implement 30, and the dozer cylinder 18 of the dozer 17.

[0085] 17, an electric motor 92 of a motor-pump assembly 91 in a rear bonnet compartment S2 is driven by power supplied from a battery 90a of a battery unit 90. A hydraulic pump 93 is driven by the output of the electric motor 92, draws hydraulic oil from the hydraulic oil tank 61, and discharges the hydraulic oil.

[0086] The hydraulic oil discharged from the hydraulic pump 93 is supplied to hydraulic devices such as hydraulic actuators of the working implement 30 via the control valves of the control valve unit 62 shown in Fig. 11, to operate the hydraulic devices. The hydraulic oil, which has been used to operate these hydraulic devices and has become hot, is cooled in the oil cooler 95 described above and is either returned to the hydraulic oil tank 61 or sucked into the hydraulic pump 93.

[0087] 7, 8, 11, etc., a pair of left and right vertical ribs 21a1 and 21a2 are erected on the platform 21 so as to penetrate the underfloor room S1 from front to rear. The through-hole 21g through which the above-mentioned turning shaft passes is located between the right vertical rib 21a1 and the left vertical rib 21a2.

[0088] The right vertical rib 21a1 extends substantially linearly in the front-to-rear direction and defines the right end face of the underfloor compartment S1. The front portion of the left vertical rib 21a2 bends to the right so as to approach the right vertical rib 21a1. The front ends of the right vertical rib 21a1 and the left vertical rib 21a2 are joined to form the bracket base 21a, which is tapered in plan view.

[0089] In the underfloor room S1, on the left side of the left vertical rib 21a2, a columnar frame 21b is erected on the platform 21. A flat front support plate 21c extending in the left-right direction is installed between the upper end of the columnar frame 21b and the upper end of the right vertical rib 21a1.

[0090] Opposite to the front support plate 21c, a flat rear support plate 21d extending in the left-right direction is fixed to the upper end of the partition plate 26. Furthermore, a flat right support plate 21e extending in the front-rear direction is formed on the upper end of the right vertical rib 21a1.

[0091] 7 and other figures, the front support plate 21c, rear support plate 21d, and right support plate 21e are disposed flush with each other at the same height, and define the front, rear, and right edges of the upper surface of the underfloor room S1. At the same time, the support plates 21c, 21d, and 21e define the front, rear, and right edges of the bottom surface of the cabin 40.

[0092] As shown in Fig. 1 and other figures, a cabin 40 serving as an operation room structure is mounted in the front half of the aircraft body 20. Inside the cabin 40, an operation room 41 is configured as shown in Fig. 9 and other figures. An operator inside the operation room 41 can see the outside of the cabin 40 through a windshield 40a at the front end face of the cabin 40, as well as transparent windows configured on the left and right end faces and the rear end face of the cabin 40.

[0093] 7, 9, etc., the lower end of the front half of the cabin 40 is configured as a floor panel 42 serving as a floor body. The front end of the floor panel 42 rests on the front support plate 21c, the left end rests on the upper end surface of the front left side cover member 22b on the left side of the lower side cover 22, and the right end rests on the right support plate 21e, and the floor panel 42 is fixed to these support plates 21c, 21d, and 21e with fasteners or the like.

[0094] The left end of the floor panel 42 extends horizontally in the front-to-rear direction along the upper end of the front left side cover member 22b. An opening for boarding and alighting is provided on the left side surface of the front half of the cabin 40, which extends upward from the upper end of the front left side cover member 22b, and a door 40b is provided to cover this opening.

[0095] 7 and 8, the lower end of the front half of the operation room 41 inside the cabin 40 is defined by a floor surface FS, which is the upper surface of the floor plate material 42. As shown in Figures 7, 8, 10, etc., the lower part of the rear half of the operation room 41 is formed by a seat base 43. The lower part of the front end surface of the seat base 43 is in contact with the rear end surface of the floor plate material 42, and its right end is placed on the right support plate 21e, and its rear end is placed on the rear support plate 21d.

[0096] As shown in Figures 7 to 10, etc., a driver's seat 44 is installed on the seat base 43. A floor surface FS is arranged extending forward in the left-right direction from the front lower end of the seat base 43. An operator seated in the driver's seat 44 can place his / her feet with the soles of his / her feet in contact with the upper surface of the floor board material 42 serving as this floor surface FS.

[0097] As shown in Figures 9, 12, etc., various operating tools that can be operated by an operator seated in the driver's seat 44 are arranged inside the control room 41. First, consoles 45L and 45R are arranged on both the left and right sides of the driver's seat 44, and a pair of left and right work operation levers 46L and 46R are arranged on the consoles 45L and 45R, respectively. In addition, left and right travel operation levers 47L and 47R are arranged extending upward from the front center of the left and right sides of the floor panel material 42.

[0098] The operator seated in the driver's seat 44 holds the head of the left control lever 46L with his left hand and the head of the right control lever 46R with his right hand, and can operate the work operation levers 46L and 46R to control each part of the work device 30. In addition, by operating the left and right travel operation levers 47L and 47R, the operator can control the forward / reverse switching, travel speed, and start / stop of the travel vehicle 10.

[0099] Furthermore, a temperature adjustment dial 48 and an airflow dial 49, which are temperature adjustment operation members, are disposed on one of the left and right sides (the right side in this embodiment) of the driver's seat 44. The temperature adjustment dial 48 and the airflow dial 49 are arranged side by side in the front and rear. In this embodiment, the temperature adjustment dial 48 is disposed in front of the airflow dial 49, but they may be disposed in either the front or the rear.

[0100] The rotation angle of the temperature adjustment dial 48 from the OFF position corresponds to the operating position, and the set temperature level is set according to the rotation angle. A signal according to this set temperature level is input to a control device 100 (see FIG. 18) described below. The temperature of air blown into the operation room 41 from an air outlet 57 (described below) and the like located behind the driver's seat 44 is adjusted according to the magnitude of this set temperature level. Similarly, the amount of air blown into the operation room 41 from the air outlet 57 and the like is adjusted according to the rotation angle of the air blower dial 49 from the OFF position (i.e., the operating position).

[0101] A bonnet center cover 25 that slopes upward and rearward is provided behind the seat base 43. The area in front of the bonnet center cover 25 is an operation compartment 41, and immediately following the bonnet center cover 25 is the front end of the rear bonnet compartment S2 that is formed in a rearward and upward slope.

[0102] An air heating unit 54, which is a component of the heating device 50, is disposed on the platform 21 in a space covered by the seat base 43 and the front of the bonnet center cover 25. The air heating unit 54 has a unit case 54a. Referring to Figure 18, the unit case 54a houses a heat exchanger 54b, a blower 54c, a flow control valve 55, and the like.

[0103] A duct 56 extends obliquely rearward and upward from the portion of the unit case 54a that houses the blower along the bonnet center cover 25, and an air outlet 57 is formed at the upper rear end of the duct 56. Air heated by hot water introduced into the unit case 54a is blown into the operation room 41 by the blower inside the unit case 54a through the duct 56 and the air outlet 57.

[0104] A heating device 50 for heating the air in the operation room 41 is configured by combining such an air heating unit 54 with a gas-liquid separation tank 58 arranged in the front part of the rear bonnet compartment S2, as shown in Figure 7, etc., a water heating unit 52 and a hot water pump 53 (hot water circulation section) arranged in the underfloor compartment S1 inside the aircraft body 20, and a hot water circulation path 51 (hot water circulation section) composed of piping, etc.

[0105] The configuration of this heating device 50 will be described with reference to Figures 6 to 11. In this description, the term "pipes" includes pipes such as hoses and metal pipes, and piping-related components such as joints that connect pipes together.

[0106] 6 is provided to the left of the control valve unit 62, which is arranged as shown in FIG. 11, in the front portion of the underfloor room S1 below the floor panel material 42. An opening facing the left-end opening of the tool box 60 is formed in the front left side cover member 22b of the lower side cover 22, which defines the left end of the underfloor room S1, and an openable and closable cover plate 28 is provided to cover this opening.

[0107] As shown in Figures 6 to 8, a water heating unit 52 serving as a heat generating part of the heating device 50 is disposed behind the tool box 60 in the underfloor compartment S1. The water heating unit 52 has a unit case 52a and a heat generating element 52b (heat generating part) as shown in Figure 18 and housed in the unit case 52a. The heat generating element 52b generates heat using power supplied from a sub-battery 63 installed in the rear bonnet compartment S2. A PTC (Positive Temperature Coefficient) heater or the like can be used as the heat generating element 52b.

[0108] 7, a water supply path 51a, which is part of a hot water circulation path 51 made up of pipes, is further drawn into a unit case 52a of the water heating unit 52. The water circulating in the hot water circulation path 51 is heated by the heat emitted from the heating element 52b as it passes through the unit case 52a, and becomes hot water.

[0109] The amount of heat generated by the heating element 52b can be adjusted by adjusting the amount of current, etc. By adjusting the amount of heat generated by the heating element 52b, the temperature of the hot water flowing through the hot water circulation path 51 can be adjusted.

[0110] A hot water pump 53 is disposed in the underfloor room S1, behind the tool box 60, near the water heating unit 52. The hot water pump 53 is an electric pump, and receives power from a sub-battery 63 together with the heating element 52b of the water heating unit 52.

[0111] The sub-battery 63 is supplemented with power from the battery 90a of the battery unit 90, which supplies power to the electric motor 92 serving as the prime mover, and can be charged. That is, the heating element 52b of the water heating unit 52 and the hot water pump 53 receive power from the battery 90a via the sub-battery 63.

[0112] It is also possible to supply power to these electrical heating devices directly from battery 90a without going through sub-battery 63. However, by providing a sub-battery 63 with a certain capacity for driving the electrical devices of heating device 50, separate from battery 90a used for driving working device 30, etc., it is possible to stably supply power to the electrical devices of heating device 50 regardless of the operating status of working device 30.

[0113] On the other hand, by making it possible to charge the sub-battery 63 with power from the battery 90a when the battery 90a has a surplus, it is possible to prevent a situation in which the heating device 50 is short of power.

[0114] 7 and 8, a hot water supply section 51b, which is part of the hot water circulation path 51, extends from a unit case 52a of the water heating unit 52 and is connected to the intake port of the hot water pump 53. As a result, the hot water heated by the water heating unit 52 is supplied to the hot water pump 53. Furthermore, a discharge hot water path 51c of the hot water circulation path 51 for conveying water discharged from the hot water pump 53 extends rearward from the hot water pump 53.

[0115] The pipes constituting the hot water circulation path 51 are routed from the underfloor compartment S1 to the rear bonnet compartment S2 through the partition plate 26 or the bonnet center cover 25. As shown in Figure 7 and other figures, a gas-liquid separation tank 58 connected to the hot water circulation path 51 is disposed in the left portion of the rear bonnet compartment S2. A refill port is formed in the upper portion of the gas-liquid separation tank 58, and is normally closed with a plug (or lid) 58a.

[0116] The gas-liquid separation tank 58 is provided with a transparent inspection window 58b, so that the water level of the heating water inside can be seen by a person standing on the left side of the work machine 1. In addition, heating water can be replenished into the gas-liquid separation tank 58 and the hot water circulation path 51 through a refill port that is opened by removing the plug 58a.

[0117] 1, 2, 5, etc., an opening is provided in the left side cover member 23a of the bonnet side cover 23 so as to face the gas-liquid separation tank 58, the refill port of which is closed. An inspection lid 27 is attached to the left side cover member 23a so as to be able to open and close freely and to close this opening.

[0118] 13 and other figures, a person standing on the left side of the work machine 1 can access the gas-liquid separation tank 58 by opening the inspection cover 27. That is, by opening the inspection cover 27, it is possible to remove the plug 58a and replenish water into the hot water circulation path 51, as described above. In addition, by opening the inspection cover 27 and checking the water level in the gas-liquid separation tank 58 through the inspection window 58b, it is possible to check the amount of water in the heating device 50 (hot water circulation path 51).

[0119] The gas-liquid separation tank 58 needs to be located at a certain height above the hot water pump 53, etc. On the other hand, if the gas-liquid separation tank 58 is too high, it becomes difficult to perform the above-mentioned operations of replenishing water through the replenishing port and checking the water level in the gas-liquid separation tank 58.

[0120] In this regard, in the work machine 1, as described above, the water heating unit 52 and the hot water pump 53 are disposed at a sufficiently low position, in the underfloor room S1 below the floorboard material 42. Therefore, the gas-liquid separation tank 58, which is disposed higher than these, can also be disposed at a height that is just right for an operator standing on the left side of the work machine 1 to perform the above-described water replenishment work and water level check work.

[0121] In addition, at the front of the rear bonnet compartment S2, pipes and the like that make up the part of the hot water circulation path 51 that extends from the air heating unit 54 to the gas-liquid separation tank 58 are arranged along the bonnet center cover 25.

[0122] The unit case 54a of the air heating unit 54 arranged as described above is connected to pipes constituting the discharge hot water passage 51c of the hot water circulation passage 51, which extends from the discharge port of the hot water pump 53.

[0123] A flow rate adjustment valve 55 is provided at the inlet of the heat exchanger 54b in the unit case 54a of the air heating unit 54. Pipes extending from the discharge port of the hot water pump 53 are connected to this flow rate adjustment valve 55 in the air heating unit 54. In this way, hot water at a flow rate adjusted by the flow rate adjustment valve 55 is introduced into the heat exchanger 54b and used for heating the air.

[0124] As described above, the temperature of the air blown out from the air outlet 57 into the operation chamber 41 is adjusted according to the amount of rotation of the temperature adjustment dial 48 from the OFF position (i.e., the set temperature level). This is done by changing the opening of the flow rate adjustment valve 55 according to the set temperature level set by the temperature adjustment dial 47.

[0125] That is, the greater the operating amount, the greater the opening of flow control valve 55, and by increasing the amount of hot water flowing into the heat exchanger in air heating unit 54, the air sent to air outlet 57 can be heated more quickly. In this way, the method of changing the flow rate of hot water can contribute to the configuration of heating device 50 that is responsive to the operation of temperature control dial 48.

[0126] On the other hand, the lower the set temperature level, the smaller the opening of the flow rate adjustment valve 55, and the less hot water is introduced into the heat exchanger 54b. In this case, if the flow path remains large and the temperature is maintained high, and only the flow rate of the hot water decreases, there is a possibility that boiling will occur locally.

[0127] Therefore, in the heating device 50 of this embodiment, the opening degree of the flow control valve 55 is changed according to the set temperature level of the temperature control dial 48, and the heat generation amount of the heating element 52b in the water heating unit 52 is changed according to the change in the opening degree of the flow control valve 55.

[0128] In other words, by reducing the set temperature level of the temperature adjustment dial 48, the opening of the flow control valve 55 becomes smaller and the hot water flow rate is reduced, which in turn reduces the heat output of the heating element of the water heating unit 52, i.e., the temperature of the hot water itself introduced into the air heating unit 54 decreases, so even if the flow rate is reduced, localized boiling as described above is prevented.

[0129] The amount of heat generated can be adjusted in this way because water heating unit 52 is an electrically powered heating device. That is, when the heat source for hot water is exhaust heat from the engine, as in the past, it was difficult to arbitrarily adjust the engine exhaust heat itself, so while it was possible to adjust the flow rate of hot water, it was difficult to adjust the temperature of the hot water itself. However, with a heating element that generates heat using electricity, it is possible to arbitrarily adjust the amount of heat generated, and even to stop the power supply from generating heat.

[0130] Furthermore, by disposing water heating unit 52 equipped with such a heating element in underfloor room S1 below floorboard material 42 of cabin 40, which is the control room structure, heat generated by the heating element in underfloor room S1 can be conducted into control room 41 via floorboard material 42. Therefore, even if heated air blown out from air heating unit 54 through air outlet 57 escapes through gaps in cabin 40, warm air is replenished from underfloor, improving the heating effect.

[0131] One of the reasons why the warm air inside the operating room 41 escapes to the outside is that it is attracted by the exhaust air generated by the rotation of the radiator fan 94a or oil cooler fan 95a arranged at the rear of the cabin 40 and escapes through the gaps in the operating room 41.

[0132] In this embodiment, the radiator fan 94a and the oil cooler fan 95a are also electric fans, and can be turned off arbitrarily or automatically. Therefore, when heating the interior of the operation room 41, the rotation of the radiator fan 94a and the oil cooler fan 95a can be stopped to prevent the warm air in the cabin 40 from escaping.

[0133] In addition, when heating is not required, such as in summer, the power supply to the heating element 52b of the water heating unit 52 is stopped in response to the temperature adjustment dial 48 being turned to the OFF position, and the heat output of the heating element is set to 0, thereby preventing the heat from the heating device 50 from being transmitted to the operation room 41.

[0134] 18 shows the control system for the heating device 50 described above and the electrical equipment related to ensuring the heating effect. A control device 100 is provided at an appropriate position, for example, inside the machine body 2 of the work machine 1. Input means such as a temperature adjustment dial 48, an airflow dial 49, a radiator fan switch 101, and an oil cooler fan switch 102 are connected to the input side interface of this control device 100.

[0135] The output side interface of the control device 100 is connected to the sub-battery 63, the heating element 52b, the hot water pump 53, the heat exchanger 54b, the blower 54c, the flow rate control valve 55, the radiator fan 94a, the oil cooler fan 95a, etc. The flow rate control valve 55 is an electromagnetic proportional valve, and is structured so that the opening degree can be changed proportionally by electromagnetic control of the solenoid.

[0136] When the operator sets the temperature adjustment dial 48 to the OFF position, the control device 100 cuts off the power supply from the sub-battery 63 to the heating element 52b and the hot water pump 53. In other words, the supply of hot water to the air heating unit 54 is stopped, and therefore the power supply for operating the heat exchanger 54b is also stopped.

[0137] On the other hand, when the temperature adjustment dial 48 is turned ON, the control device 100 starts supplying power from the sub-battery 63 to the heating element 52b and the hot water pump 53. Furthermore, the control device 100 electromagnetically controls the solenoid of the flow rate adjustment valve 55 to adjust its opening according to the amount of rotation (operation position, set temperature level) of the temperature adjustment dial 48, thereby adjusting the amount of hot water supplied to the heat exchanger 54b. At the same time, the control device 100 adjusts the amount of heat generated by the heating element 52b according to the amount of rotation (operation position, set temperature level), thereby adjusting the temperature of the hot water discharged from the hot water pump 53 to the flow rate adjustment valve 55.

[0138] Furthermore, when the operator sets the air blowing dial 49 to the OFF position, the control device 100 cuts off the power supply from the sub-battery 63 to the blower 54c, thereby stopping the blowing of air into the operation room 41 through the air outlet 57.

[0139] On the other hand, when the air blowing dial 49 is turned ON, the control device 100 starts supplying power to the blower 54c from the sub-battery 63. Furthermore, the control device 100 adjusts the rotation speed of the blower 54c according to the rotation amount (operation position, set temperature level) of the air blowing dial 49, and adjusts the amount of air blown from the air outlet 57 to the operation room 41.

[0140] The operation of the airflow dial 49 can be performed regardless of the ON / OFF status or the operating position (operation amount) of the temperature adjustment dial 48. By operating the airflow dial 49 while the temperature adjustment dial 48 is ON, the amount of air heated by the heat exchanger 54b being blown can be adjusted.

[0141] In addition, the control device 100 determines whether to rotate the radiator fan 94a or not based on the ON / OFF state of the radiator fan switch 101, and determines whether to rotate the oil cooler fan 95a or not based on the ON / OFF state of the oil cooler fan switch 102.

[0142] By providing such a radiator fan switch 101 and an oil cooler fan switch 102 in the operation room 41, the operator can turn off these switches at will to stop the rotation of the fans 94a and 95a when he or she wants to increase the heating effect of the heating device 50.

[0143] The radiator fan switch 101 and the oil cooler fan switch 102 do not have to be operated by an operator, and may be automatically controlled to be switched on and off. One possible way to automatically control these fans to improve the heating effect of the heating device 50 is to, for example, detect the temperatures of the coolant and hydraulic oil when the temperature adjustment dial 48 is turned on, and if it is determined that there is no urgent situation that requires the operation of the radiator 94 or the oil cooler 95, stop the rotation of these fans 94a and 95a.

[0144] The above-described work machine 1 includes a machine body 20, a work device 30 provided on the machine body 20, a cabin 40 as an operation room structure mounted on the machine body 20, which includes an operation room 41 and floor panels 42 that form the floor surface FS of the operation room 41, and a heating device 50 for heating the inside of the operation room 41. The heating device 50 includes a heating element 52b (water heating unit 52) ​​that generates heat using electricity, and a hot water circulation part (hot water circulation path 51, hot water pump 53, etc.) that circulates water heated by the heat generated by the heating element 52b. At least the water heating unit 52 of the heating device 50 is disposed in an underfloor room S1, which is a space within the machine body 20 below the floor panels 42.

[0145] This configuration not only provides a heating effect from the hot water of the heating device 50, but also improves heating efficiency through the heat generated by the heating element 52b (heat-generating portion) itself in the water heating unit 52 located in the underfloor space S1 (the space within the machine body 20) below the floorboards 42 (floor surface body). Furthermore, by configuring the heating element 52b (heat-generating portion) to generate heat using electricity, turning it off during periods when heating is not needed, such as in summer, prevents the heat generated by the heating element 52b (heat-generating portion) from affecting the interior of the operation room 41 and prevents heat from the heating element 52b from propagating into the operation room 41. Furthermore, using the dead space under the floor to locate the water heating unit 52, including the heating element 52b (heat-generating portion), reduces the volume of the space required for arranging other equipment, contributing to a more compact overall work machine. Furthermore, locating the hot water circulation path in a relatively low part of the machine body improves the flexibility of arranging the gas-liquid separation tank 58 and the water supply port.

[0146] The work machine 1 also has an operating member (temperature adjustment dial 48) for adjusting the indoor temperature located in the operating room 41, and the hot water circulation unit has a hot water pump 53 which is an electrically powered pump for discharging hot water, and the operating member (temperature adjustment dial 48) also serves as an operating member for simultaneously setting the heating element 52b (heat generating unit) and the hot water pump 53 to an energized state and simultaneously setting them to an unenergized state.

[0147] In this way, by enabling the heating element 52b (heat generating section) of the heating device 50 and the hot water pump 53 to be energized or de-energized simultaneously, when the heating device 50 is not in heating operation, they are simultaneously de-energized, thereby achieving a power saving effect.

[0148] The operating member is a temperature adjustment dial 48, which is a dial switch that can change the set temperature level by changing its operating position. The amount of heat generated by the heating element 52b (heat generating portion) increases as the set temperature level of the temperature adjustment dial 48 increases.

[0149] In this way, the water heating unit 52 (heat generating unit) and the hot water pump 53 can be simultaneously energized and de-energized by operating the normally provided dial switch, making operation easy for the operator and reducing costs as no special operating parts need to be added.

[0150] The work machine 1 also includes a battery 90a provided in the machine body 20, and an electric motor 92 provided in the machine body 20 and driven by power supplied from the battery 90a. The work device 30 is driven by the output of the electric motor 92, and the heating element 52b (heat generating portion) generates heat by power supplied from the battery 90a.

[0151] As a result, when the heating device 50 as a hot water heater is provided in the work machine 1 as an electric work machine having the electric motor 92 as a prime mover, the battery 90a for supplying power to the electric motor 92 as a prime mover can be used as a power source.

[0152] Furthermore, the work machine 1 uses a battery 90a as a main battery, and is provided with a sub-battery 63 separate from the main battery 90a in the machine body 20. The sub-battery 63 is charged with power from the battery 90a serving as the main battery. The heating element 52b (heat generating portion) generates heat using power supplied from the sub-battery 63.

[0153] This allows power to be supplied stably to the electrical devices of the heating device 50 regardless of the operating status of the working device 30. On the other hand, by making it possible to charge the sub-battery 63 with power from the main battery 90a when the main battery 90a has a power reserve, it is possible to prevent a power shortage for the heating device 50.

[0154] The work machine 1 also includes a radiator 94 for cooling the battery 90a and the electric motor 92, and the radiator 94 includes an electric radiator fan 94a that can be switched between an energized state and a non-energized state.

[0155] Conventional engine radiator fans rotate constantly while the engine is running, and the wind generated by the engine radiator fan can sometimes reduce the heating efficiency of the control room 41. However, in the work machine 1, the prime mover is an electric motor 92, the radiator fan 94a cools the power supply battery 90a and the electric motor 92, and by using the radiator fan 94a as an electric fan, it can be de-energized to stop rotation, and stopping rotation can increase the heating effect inside the control room 41.

[0156] The work machine 1 also includes a hydraulic pump 93 that is driven by the output of the electric motor 92 to discharge hydraulic oil, a hydraulic actuator that is driven by the hydraulic oil to operate the work device 30, and an oil cooler 95 (hydraulic oil cooler) for cooling the hydraulic oil. The oil cooler 95 includes an oil cooler fan 95a that is an electrically operated hydraulic oil cooling fan that can be switched between an energized state and a non-energized state.

[0157] In this way, by making the oil cooler fan 95a (hydraulic oil cooling fan) also an electric fan, it can be de-energized to stop rotation, and by stopping rotation, the heating effect inside the operation room 41 can be improved.

[0158] The work machine 1 also includes a PTC heater as the heat generating element 92b (heat generating portion).

[0159] In this way, by using a PTC heater, costs can be reduced.

[0160] The work machine 1 also includes a machine body 20, a work device 30 provided on the machine body 20, a driver's seat 44 provided on the machine body 20, and a heating device 50 that heats the area around the driver's seat 44. The heating device 50 includes a heating element 52b (water heating unit 52) ​​that generates heat using electricity, and a hot water circulation section (hot water circulation path 51, hot water pump 53, etc.) that circulates water heated by the heat generated by the heating element 52b. The hot water circulation section includes a flow rate adjustment valve 55 that adjusts the flow rate of hot water by changing its opening. The amount of heat generated by the heating element 52b changes in response to changes in the opening of the flow rate adjustment valve 55.

[0161] With the above configuration, in addition to adjusting the flow rate of hot water by changing the opening of the flow rate adjustment valve as in the conventional system, the heat generation amount of the heating element 52b (heat generating portion) is also changed to adjust the temperature of the hot water itself in response to the temperature adjustment operation (turning of a dial switch, etc.) of the operator seated in the operator's seat 44. Therefore, for example, when the opening of the flow rate adjustment valve 55 is reduced to reduce the flow rate of hot water, it is possible to reduce the heat generation amount of the heating element 52b (heat generating portion) and lower the temperature of the hot water, preventing local boiling of the hot water whose flow rate has been reduced.

[0162] Furthermore, the amount of heat generated by the heating element 52b (heat generating portion) decreases as the opening of the flow rate adjusting valve 55 decreases.

[0163] With the above configuration, when the flow rate is reduced by reducing the opening of flow rate adjustment valve 55, the amount of heat generated by heating element 52b (heat generating portion) is reduced, thereby preventing local boiling of the hot water as described above. This makes it possible to avoid damage to hot water pump 53 due to boiling of hot water, and improve the durability of hot water pump 53.

[0164] The work machine 1 also includes a PTC heater as the heat generating element 52b (heat generating portion).

[0165] In this way, by using a PTC heater as the heating element 52b (heat generating portion), costs can be reduced.

[0166] The work machine 1 also includes an operating member (temperature adjustment dial 48) that is provided around the driver's seat 44 and that can operate the set temperature level. The flow rate adjustment valve 55 adjusts its opening depending on the set temperature level of the operating member (temperature adjustment dial 48).

[0167] With the above configuration, by operating the operating member (temperature adjustment dial 48) for adjusting the opening of flow control valve 55, the opening of flow control valve 55 and the heat generation amount of heating element 52b (heat generation portion) are adjusted simultaneously, and there is no need to provide a separate operating member or perform a separate operation to adjust the heat generation amount of heating element 52b (heat generation portion), which has the effect of suppressing the problems described above with respect to heating device 50 and improves operability for the person operating heating device 50.

[0168] The operating member is a temperature adjustment switch 48 (dial switch) that can change the set temperature level by operating the operating position. The flow rate adjustment valve 55 opens more as the set temperature level of the temperature adjustment switch 48 (dial switch) increases.

[0169] As the set temperature level set by the temperature adjustment dial 48 increases, the opening of the flow rate adjustment valve 55 increases and the heat generation amount of the heating element 52b (heat generating portion) also increases. In other words, the operation for achieving the effects of the heating device 50 as described above uses the same temperature adjustment operation method as before, so the operator does not feel any discomfort and can enjoy the same good operability as before.

[0170] The work machine 1 also includes a battery 90a provided in the machine body 20, and an electric motor 92 provided in the machine body 20 and driven by power supplied from the battery 90a. The work device 30 is driven by the output of the electric motor 92, and the heating element 52b (heat generating portion) generates heat by power supplied from the battery 90a.

[0171] As a result, when the heating device 50 as a hot water heater is provided in the work machine 1 as an electric work machine having the electric motor 92 as a prime mover, the battery 90a for supplying power to the electric motor 92 as a prime mover can be used as a power source.

[0172] Furthermore, the work machine 1 uses a battery 90a as a main battery, and is provided with a sub-battery 63 separate from the main battery 90a in the machine body 20. The sub-battery 63 is charged with power from the battery 90a serving as the main battery. The heating element 52b (heat generating portion) generates heat using power supplied from the sub-battery 63.

[0173] This allows power to be supplied stably to the electrical devices of the heating device 50 regardless of the operating status of the working device 30. On the other hand, by making it possible to charge the sub-battery 63 with power from the main battery 90a when the main battery 90a has a power reserve, it is possible to prevent a power shortage for the heating device 50.

[0174] Although the present invention has been described above, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims.

[0175] In the above-described embodiment, an example has been described in which the present invention is applied to a rotary excavator (backhoe), but the application of the present invention is not limited to this, and the present invention may also be applied to other construction machinery such as wheel loaders, compact track loaders, and skid steer loaders, as well as agricultural machinery such as tractors, combine harvesters, rice transplanters, and lawn mowers. [Explanation of symbols]

[0176] 1. Work equipment (swivel-type excavator) 20 Aircraft (swivel) 30 Work equipment 40 Cabin (operation room structure) 41 Control room 44 Driver's seat 48 Temperature adjustment dial (operating part) 50 Heating equipment 51 Hot water circulation path (hot water circulation section) 52 Water heating unit 52b Heating element (heating part) 53 Hot water pump (hot water circulation section) 63 Sub-battery 90a Battery (Main Battery) 92 Electric motor 93 Hydraulic Pump 94 Radiator 94a Radiator fan 95 Oil cooler (hydraulic oil cooler) 95a Oil cooler fan (hydraulic oil cooling fan)

Claims

1. The aircraft and a working device provided on the machine body; an operation room structure mounted on the aircraft body, the operation room structure having an operation room and a floor body that forms a floor surface of the operation room; a heating device for heating the inside of the operation room; an operating member for adjusting the room temperature disposed in the operating room; Equipped with The heating device includes a heat generating unit that generates heat using electric power and a hot water circulating unit that circulates water heated by the heat generating unit, At least the heat generating portion of the heating device is disposed in a space within the machine body below the floor body, the hot water circulation unit has an electrically driven pump for discharging hot water, The operating member also serves as an operating member for simultaneously setting the heat generating unit and the pump to an energized state and simultaneously setting them to an unenergized state.

2. the operating member is a dial switch whose operating position can be changed to change the set temperature level, The work machine according to claim 1 , wherein the heat generation amount of the heat generating portion increases as the set temperature level of the operating member increases.

3. a battery provided on the airframe; an electric motor provided on the airframe and driven by power supplied from the battery; Equipped with the working device is driven by the output of the electric motor, 3. The work machine according to claim 1, wherein the heat generating portion generates heat by power supplied from the battery.

4. The battery is a main battery, a sub-battery separate from the main battery is provided in the airframe; The sub-battery is charged with power from the main battery, The work machine according to claim 3, wherein the heat generating portion generates heat by power supplied from the sub-battery.

5. a radiator for cooling the battery and the electric motor; 4. The work machine according to claim 3, wherein the radiator includes an electric radiator fan that can be switched between an energized state and a de-energized state.

6. a hydraulic pump driven by the output of the electric motor to discharge hydraulic oil; a hydraulic actuator driven by the hydraulic oil to operate the working device; a hydraulic oil cooler for cooling the hydraulic oil; Equipped with 6. The work machine according to claim 3 or 5, wherein the hydraulic oil cooler includes an electric hydraulic oil cooling fan that can be switched between an energized state and a de-energized state.

7. The work machine according to any one of claims 1 to 6, wherein the heat generating portion is a PTC heater.

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