Construction machinery

Abstract

To provide a construction machine that can reduce vibration load on a gas container.SOLUTION: A hydraulic shovel 1 includes a movable lower traveling body 2 capable of traveling and an upper revolving body 3, and a work device 4 attached to the upper revolving body 3. The upper revolving body 3 comprises: a revolving frame 5 to which the work device 4 is attached, a gas engine 13 mounted on the revolving frame 5, and a floor member 8 supported by the revolving frame 5 via a vibration-proof rubber 18C, an upper elastic body 22A, and a lower elastic body 22B. A gas container 25 for storing gas fuel for the gas engine 13 and a driver's seat 7 are placed on the floor member 8.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to construction machines such as hydraulic excavators and wheel loaders equipped with a gas engine as a prime mover.

Background Art

[0002] For example, a hydraulic excavator, which is a representative example of a construction machine, includes a self-propelled lower traveling body, an upper revolving body that is rotatably mounted on the lower traveling body via a slewing device, and a working device provided on the front side of the upper revolving body. The upper revolving body has a revolving frame as a base, and the revolving frame is equipped with a prime mover such as a diesel engine, a hydraulic pump driven by the prime mover, a hydraulic oil tank for storing hydraulic oil, and an exterior cover (a building cover) that covers these prime mover, hydraulic pump, hydraulic oil tank, etc.

[0003] Here, in recent years, due to global environmental problems and responses to exhaust gas regulations, the price of engines has been soaring. For this reason, for example, in automobiles and forklifts, the installation of gas engines with clean exhaust gas and excellent cost performance, such as gas engines using liquefied petroleum gas (LPG) as fuel, has been progressing. On the other hand, Patent Document 1 describes a work vehicle equipped with a gas engine using LPG as fuel and a gas container (gas cylinder). Further, Patent Document 2 describes a construction machine in which a gas container (gas cylinder) filled with natural gas (NG) as fuel is disposed inside a counterweight.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] For example, when using LPG as a gas fuel, it is mandatory to use gas containers (gas cylinders) that have passed container inspections. In automobiles and forklifts, where gas engines are widely used, gas fuel is generally used by filling gas containers (gas cylinders) provided by gas suppliers, or by replacing the gas containers (gas cylinders). In the case of automobiles and forklifts, since they are equipped with rubber tires, vibrations when traveling on rough roads can be dampened. Therefore, the vibration load on the gas container when traveling on rough roads can be reduced. In contrast, in construction machinery that is driven by steel tracks, the vibration load when traveling on rough roads is large, so it is desirable to reduce the vibration of the gas container. Furthermore, if a large vibration is applied to the gas container, it is desirable that the operator be able to quickly recognize that a large vibration has been applied to the gas container.

[0006] The objective of the present invention is to provide a construction machine that can reduce vibration load on a gas container and detect when a large vibration is applied to the gas container. [Means for solving the problem]

[0007] The present invention relates to a construction machine having a drivable vehicle body and a work device attached to the vehicle body, wherein the vehicle body comprises a vehicle frame to which the work device is attached, a gas engine mounted on the vehicle frame, and a floor member supported on the vehicle frame via a plurality of support members having elastic members, wherein the floor member comprises a driver's seat mounting portion to which a driver's seat is attached, a footrest portion provided on the work device side of the driver's seat mounting portion, and a gas container mounting portion extending from the footrest portion in the width direction of the vehicle frame and on which a gas container for storing gas fuel for the gas engine is placed, and the plurality of support members include support members below the gas container mounting portion that support the gas container mounting portion to the vehicle frame. Furthermore, the gas container is mounted on a gas container mounting bracket provided on the gas container mounting section in a manner that allows for attachment and removal. . [Effects of the Invention]

[0008] According to the present invention, the vibration load on the gas container can be reduced. [Brief explanation of the drawing]

[0009] [Figure 1] This is a left side view showing a hydraulic excavator according to an embodiment. [Figure 2] Figure 1 is a front view of a hydraulic excavator with its working equipment removed, seen from the left side. [Figure 3] This is a perspective view showing the slewing frame, floor members, gas container, hydraulic oil tank, counterweight, etc. [Figure 4] This is a perspective view showing the slewing frame, gas engine, counterweight, etc. [Figure 5] This is a cross-sectional view showing the counterweight, the vibration-damping bracket for the counterweight, the vibration-damping member, the floor support member, the mounting plate portion of the floor member, etc. [Figure 6] This is an exploded perspective view showing the tilt support member, the footrest portion of the floor member, etc. [Figure 7] This is a perspective view of the floor material from the front left side. [Figure 8] This is a perspective view of the floor material from the front right side. [Figure 9] This is a side view showing a gas container and a gas container mounting bracket. [Figure 10] Figure 9 is a front view of the gas container and gas container mounting bracket, seen from the right side. [Figure 11] This is a perspective view showing the gas container mounting bracket. [Modes for carrying out the invention]

[0010] The embodiments will be described in detail below, using a hydraulic excavator, a representative construction machine (working machine), and more specifically, a small hydraulic excavator, as an example, with reference to the attached drawings.

[0011] In the following description, the front-rear direction of the hydraulic excavator 1 is defined such that the front side is the side of the working device 4, and the rear side is the side of the counterweight 12, which is opposite to the working device 4. The left-right direction of the hydraulic excavator 1 is the direction perpendicular to the front-rear direction. For example, in FIG. 1, the left-right direction of the paper surface corresponds to the front-rear direction (X direction) of the hydraulic excavator 1, the front-back direction of the paper surface corresponds to the left-right direction (Y direction) of the hydraulic excavator 1, and the up-down direction of the paper surface corresponds to the up-down direction (Z direction) of the hydraulic excavator 1.

[0012] The hydraulic excavator 1 as a construction machine (working machine) is used, for example, at work sites such as civil engineering, demolition, and underground construction. The hydraulic excavator 1 of the embodiment is configured as a small-sized (for example, with a machine weight of about 1 to 6 tons) hydraulic excavator (mini excavator, small hydraulic excavator) suitable for work at a narrow work site. Further, the hydraulic excavator 1 of the embodiment is configured as a cab-type hydraulic excavator 1.

[0013] The hydraulic excavator 1 includes a self-propelled crawler-type lower traveling body 2, an upper revolving body 3 rotatably mounted on the lower traveling body 2, and a working device 4 provided on the upper revolving body 3. The lower traveling body 2 and the upper revolving body 3 constitute the vehicle body of the hydraulic excavator 1. The vehicle body is capable of traveling and revolving. A swing-type working device 4 is swingably attached to the front side of the upper revolving body 3. The hydraulic excavator 1 performs earth and sand excavation work and the like using the working device 4.

[0014] The lower traveling body 2 includes, for example, a crawler 2A formed in an endless shape with a plurality of shoes attached thereto, and left and right traveling hydraulic motors (not shown) that drive the crawler 2A to circulate to make the hydraulic excavator 1 travel (self-propel). A slewing device including a slewing bearing and a slewing hydraulic motor is provided between the lower traveling body 2 and the upper revolving body 3.

[0015] The working device 4, also called the front device or the working implement, has a swing post 4A provided on the front side of the swing frame 5 so as to be swingable in the left - right direction. A boom 4B is rotatably attached to the swing post 4A, an arm 4C is rotatably attached to the tip of the boom 4B, and a bucket 4D as a working tool is rotatably attached to the tip of the arm 4C. Further, the working device 4 includes a swing cylinder (not shown) for swinging the swing post 4A, a boom cylinder 4E for rotating the boom 4B, an arm cylinder 4F for rotating the arm 4C, and a bucket cylinder 4G as a working tool cylinder for rotating the bucket 4D.

[0016] The upper swing body 3 is mounted on the lower traveling body 2 so as to be swingable. The upper swing body 3 swings on the lower traveling body 2 when the swing hydraulic motor of the swing device is driven. Here, the width dimension in the left - right direction of the upper swing body 3 is set to be equal to the vehicle width of the lower traveling body 2. Thereby, the hydraulic excavator 1 is configured as a rear - ultra - small swing type hydraulic excavator in which when the upper swing body 3 swings on the lower traveling body 2, the rear surface 12A of the counterweight 12 is within 120% of the vehicle width of the lower traveling body 2.

[0017] The upper swing body 3 includes, for example, a swing frame 5 as a vehicle body frame, a gas engine 13 (FIG. 4) serving as a prime mover of the hydraulic excavator 1, and a floor member 8 to which a driver's seat 7 on which an operator sits is attached. A cab box 9 for partitioning the operator's cab is provided on the floor member 8. The cab box 9 is formed as a box - shaped body that covers the periphery and the upper part of the driver's seat 7. That is, the cab box 9 is formed in a box shape surrounded by a front surface 9A, a rear surface 9B, a left side surface 9C, a right side surface 9D, and an upper surface 9E, and the interior thereof serves as the operator's cab.

[0018] Inside the cab box 9 are the operator's seat 7, and the travel levers and pedals 10 and work levers 11 for operating the hydraulic excavator 1. By operating the travel levers and pedals 10 and the work levers 11, the operator can perform actions such as traveling with the lower travel body 2, rotating the upper slewing body 3, and excavating with the work equipment 4.

[0019] The slewing frame 5 constitutes the support structure (base frame) of the upper slewing body 3. As shown in Figure 4, the slewing frame 5 is composed of a bottom plate 5A, a left vertical plate 5B, a right vertical plate 5C, a horizontal plate 5D, a top plate 5E, a left side frame 5F, and a right side frame 5G. The bottom plate 5A is formed from a thick steel plate and extends in the front-to-back direction. The left vertical plate 5B and the right vertical plate 5C are erected on the bottom plate 5A and extend in the front-to-back direction so that the distance between them widens from the front to the rear. The horizontal plate 5D is erected on the bottom plate 5A and extends in the left-to-right direction, connecting the left vertical plate 5B and the right vertical plate 5C. The top plate 5E is provided above the left vertical plate 5B and the right vertical plate 5C and extends from the middle of the front-to-back direction of the left vertical plate 5B and the right vertical plate 5C towards the front.

[0020] The left side frame 5F extends from the front end of the bottom plate 5A to the left, then bends and extends to the rear. The right side frame 5G extends from the front end of the bottom plate 5A to the right, then bends and extends to the rear. The front ends of the bottom plate 5A, left vertical plate 5B, right vertical plate 5C, and top plate 5E form a work device support section 5H that protrudes forward. The swing post 4A of the work device 4 is attached to this work device support section 5H so as to be able to swing from side to side.

[0021] At the front of the swivel frame 5, a left front beam 5J is provided, extending horizontally above the left side frame 5F. Also, at the front of the swivel frame 5, to the right of the right vertical plate 5C, a right front bracket 5K is provided, which supports the floor member 8 from below together with the left front beam 5J and the upper plate 5E. The right front bracket 5K comprises a rising plate portion 5K1 attached to the right side frame 5G and rising from the right side frame 5G, and an upper plate portion 5K2 connected to the upper end of the rising plate portion 5K1 and extending horizontally above the right side frame 5G. The right front bracket 5K is formed in an L-shape overall by the rising plate portion 5K1 and the upper plate portion 5K2. The left front beam 5J, upper plate 5E, and right front bracket 5K, which are at the front of the swivel frame 5, are each attached to a tilt support member 18, which will be described later.

[0022] The slewing frame 5 is supported by a tilt support member 18, which allows the floor member 8 to tilt together with the cab box 9 around the tilt support member 18. The slewing frame 5 is also equipped with a counterweight 12, a gas engine 13 (Figure 4), a hydraulic pump 14 (Figure 4), a hydraulic oil tank 15 (Figure 3), and a control valve device (not shown). In this case, the work device 4 is attached to the front of the slewing frame 5, and the counterweight 12 is attached to the rear of the slewing frame 5. An exterior cover 16 is also provided on the slewing frame 5 to cover the various equipment mounted on it.

[0023] The counterweight 12 is located at the rear end of the upper slewing body 3. Specifically, the counterweight 12 is positioned behind the cab box 9 and located at the rear end of the slewing frame 5 in order to balance the weight with the work device 4. The counterweight 12 is formed as a curved weight that extends in the left-right direction, with its center in the left-right direction protruding rearward. As a result, the rear surface 12A of the counterweight 12 is formed as a curved surface that fits within a virtual circle of a certain slewing radius when the upper slewing body 3 is slewing.

[0024] The counterweight 12 is directly fixed to the slewing frame 5 without the use of an elastic member. That is, the counterweight 12 is part of the same vibration system as the slewing frame 5. As shown in Figures 4 and 5, a vibration isolation member bracket 12B for attaching the vibration isolation member 22 (described later) is provided on the upper front side of the counterweight 12. The floor support member 21 is attached to the vibration isolation member bracket 12B via the vibration isolation member 22. The mounting plate portion 8E of the floor member 8 is attached to the floor support member 21.

[0025] The gas engine 13 is located in front of the counterweight 12 and mounted on the slewing frame 5. The gas engine 13 is supported by a plurality of mounting members 13A behind the lateral plate 5D of the slewing frame 5. The gas engine 13 is the prime mover that serves as the power source (drive source) for the hydraulic excavator 1. The gas engine 13 is driven by fuel such as liquefied petroleum gas (LPG) as a gas fuel. The gas engine 13 is mounted on the slewing frame 5 in a transverse position that extends in the left-right direction. The gas engine 13 is supplied with gas fuel from a gas container 25, also called a gas cylinder. The gas container 25 is filled with liquid gas fuel. Although not shown in the diagram, a vaporizer is provided in the fuel supply line between the gas container 25 and the gas engine 13 to vaporize the gas fuel. The vaporizer is located, for example, at the rear end of the slewing frame 5.

[0026] The hydraulic pump 14 is mounted on the left side, which is one end of the gas engine 13. The hydraulic pump 14 is driven by the gas engine 13. The hydraulic pump 14 draws in hydraulic fluid stored in the hydraulic fluid tank 15 and discharges (supplies) pressurized oil toward the control valve device. The hydraulic pump 14 supplies pressurized oil to various hydraulic actuators (hydraulic cylinders, hydraulic motors), such as the boom cylinder 4E, via the control valve device.

[0027] The control valve device is a group of control valves consisting of multiple directional control valves. The control valve device distributes pressurized oil discharged from the hydraulic pump 14 to multiple hydraulic actuators (hydraulic cylinders, hydraulic motors), such as the boom cylinder 4E, in response to the operation of the travel lever / pedal 10 and the work lever 11. This allows the hydraulic excavator 1 to travel, rotate, excavate, and perform other operations.

[0028] The hydraulic oil tank 15 is located on the front right side of the slewing frame 5. The hydraulic oil tank 15 is positioned to the right of the gas container mounting bracket 26 (described later) and is located between the right vertical plate 5C and the right side frame 5G. The hydraulic oil tank 15 consists of a rectangular parallelepiped container that extends vertically and stores the hydraulic oil supplied to the various hydraulic actuators mounted on the hydraulic excavator 1.

[0029] The exterior cover 16 is located around the floor member 8 (in other words, the cab box 9) and is mounted on the slewing frame 5. The exterior cover 16 covers equipment such as a heat exchanger and a hydraulic oil tank 15 mounted on the slewing frame 5. The exterior cover 16 is composed of a rear cover 16A that covers equipment such as the heat exchanger to the right of the partition plate portion 8F of the floor member 8 (in other words, the right side 9D of the cab box 9), an upper cover 16B that covers equipment mounted on the right rear side of the slewing frame 5 together with the rear cover 16A, a front cover 16C (Figure 2) located in front of the rear cover 16A that covers equipment such as the hydraulic oil tank 15, and a partition cover 16D that separates the hydraulic oil tank 15 from the gas container 25. The gas container 25 is exposed from the exterior cover 16. That is, the gas container 25 is not covered by the exterior cover 16. The gas container 25 is placed in a roughly rectangular space (gas container placement space) partitioned by the partition plate portion 8F of the floor member 8 (right side 9D of the cab box 9) and the exterior cover 16 (rear cover 16A, front cover 16C, partition cover 16D), and is exposed to the outside. A gas container cover may be provided to cover the gas container 25.

[0030] The floor member 8 is positioned to the left of the slewing frame 5, covering the front and top of the gas engine 13. The front of the floor member 8 is supported via a tilt support member 18 so as to be able to rotate (tilt up, tilt down) to the front position of the slewing frame 5. The rear of the floor member 8 is attached to a floor support member 21 provided on the upper part of the counterweight 12 and is supported in a removable manner.

[0031] As shown in Figures 3 and 4, the floor member 8 is composed of a footrest portion 8A, a rising portion 8B, a driver's seat mounting portion 8C, a back plate portion 8D, a mounting plate portion 8E, and a partition plate portion 8F which serves as a wall surface. The footrest portion 8A is the area where the operator places their feet and constitutes the bottom of the driver's cab enclosed by the floor member 8 and the cab box 9. The footrest portion 8A is supported by the slewing frame 5 via a tilting support member 18. In this case, the footrest portion 8A is located on the left side (the side of the entrance / exit where the operator enters and exits), which is one side in the width direction (left-right direction) on the front side in the front-rear direction of the slewing frame 5. That is, the footrest portion 8A is located between the work device support portion 5H and the left side frame 5F with respect to the width direction (left-right direction) of the slewing frame 5. The rising portion 8B rises upward from the rear of the footrest portion 8A. The driver's seat mounting section 8C extends rearward from the upper end of the rising section 8B toward the upper side of the gas engine 13. The driver's seat 7 is attached to the driver's seat mounting section 8C. The backrest section 8D extends diagonally upward from the rear end of the driver's seat mounting section 8C.

[0032] The mounting plate portion 8E extends rearward from the upper end of the back plate portion 8D. The mounting plate portion 8E is attached to the counterweight 12 via the vibration-damping member 22 and the floor support member 21. The partition plate portion 8F rises upward from the right side of the footrest portion 8A, that is, from the opposite side in the left-right direction from the entrance / exit where the operator enters and exits, and extends in the front-rear direction. As will be described later, the floor member 8 has a gas container mounting portion 8G as a first extension portion that extends to the right of the partition plate portion 8F from the footrest portion 8A. The gas container 25 is placed on the gas container mounting portion 8G via the gas container mounting bracket 26.

[0033] Next, the support structure of the floor member 8 for the slewing frame 5 and counterweight 12 will be described.

[0034] First, let's explain the support structure on the front of the floor member 8. A tilt support member 18 is provided between the front of the floor member 8 (footrest portion 8A) and the front of the slewing frame 5. The tilt support member 18 is positioned on the left front beam 5J, the upper plate 5E, and the right front bracket 5K of the slewing frame 5, respectively. The tilt support member 18 is attached to the front of the floor member 8 (and cab box 9) so that it can tilt up and tilt down (tilt) relative to the slewing frame 5, using the axis extending in the width direction (left-right direction) of the slewing frame 5 as the axis of rotation. As shown in Figure 6, the tilt support member 18 includes a frame-side bracket 18A attached to the swivel frame 5 (left front beam 5J, upper plate 5E, right front bracket 5K) by bolts 19, a floor-side bracket 18B attached to the floor member 8 (footrest 8A) so as to correspond to the frame-side bracket 18A, an anti-vibration rubber 18C as an elastic member provided on the frame-side bracket 18A, and a connecting pin 18E that rotatably (tiltably) connects the frame-side bracket 18A and the floor-side bracket 18B via the anti-vibration rubber 18C.

[0035] The frame-side bracket 18A consists of a mounting base 18A1 fixed to the swivel frame 5 using bolts 19, and a cylindrical support cylinder portion 18A2 provided on the mounting base 18A1, with its central axis in the width direction (left-right direction) of the swivel frame 5. The floor-side bracket 18B consists of a pair of plates 18B1. The pair of plates 18B1 are arranged parallel to each other with a spacing larger than the width dimension of the support cylinder portion 18A2 of the frame-side bracket 18A. A pin support hole 18B2 is formed approximately in the center of each plate 18B1 of the floor-side bracket 18B to support the end of the connecting pin 18E. In addition, a screw hole 18B3 is formed in one of the plates 18B1 into which an anti-rotation bolt 18F is screwed.

[0036] The vibration-damping rubber 18C is formed in a thick cylindrical shape using, for example, an elastic rubber material. The vibration-damping rubber 18C is inserted into the support cylinder portion 18A2 of the frame-side bracket 18A. The center of the vibration-damping rubber 18C is a pin insertion hole 18C1 through which the connecting pin 18E is inserted. The vibration-damping rubber 18C absorbs and mitigates vibrations transmitted from the swivel frame 5 to the floor member 8 by elastically deforming between the frame-side bracket 18A and the floor-side bracket 18B (connecting pin 18E).

[0037] The connecting pin 18E passes through the pin insertion hole 18C1 of the vibration-damping rubber 18C, which is fitted into the support cylinder portion 18A2 of the frame-side bracket 18A, and both ends are attached to the pin support holes 18B2 of the plate body 18B1 of the floor-side bracket 18B. A washer 18G is placed between the plate body 18B1 and the vibration-damping rubber 18C. In addition, a radially extending anti-rotation portion 18E1 is provided on one end of the connecting pin 18E. An insertion hole 18E2 is formed in the anti-rotation portion 18E1 through which an anti-rotation bolt 18F is inserted. The anti-rotation bolt 18F is inserted through the insertion hole 18E2 of the anti-rotation portion 18E1 of the connecting pin 18E1, with the connecting pin 18E inserted through the pin insertion hole 18C1 of the vibration-damping rubber 18C and the pin support hole 18B2 of the plate body 18B1, and is screwed into the threaded hole 18B3 of the plate body 18B1.

[0038] As described above, the tilt support member 18 is attached to the slewing frame 5 by bolts 19. The floor-side bracket 18B, which is a component of the footrest portion 8A of the floor member 8, is provided with a pin support hole 18B2. The pin support hole 18B2 is positioned coaxially with the pin insertion hole 18C1 of the vibration-damping rubber 18C of the tilt support member 18, via a washer 18G. The connecting pin 18E is inserted so as to pass through the pin support hole 18B2 and the pin insertion hole 18C1. A rotation-preventing bolt 18F is inserted into the insertion hole 18E2 of the rotation-preventing portion 18E1 of the connecting pin 18E. By tightening the rotation-preventing bolt 18F into the screw hole 18B3 of the floor-side bracket 18B, the floor member 8 is supported by the tilt support member 18 on the slewing frame 5 in a tiltable and vibration-damped state. The cab box 9 is fixed on the floor member 8.

[0039] Next, the support structure on the rear side of the floor member 8 will be described. The rear side (mounting plate portion 8E) of the floor member 8 is supported by the floor support member 21 shown in Figures 4 and 5. The floor support member 21 is supported by a vibration-damping member bracket 12B provided on the counterweight 12 via a vibration-damping member 22. As a result, the mounting plate portion 8E of the floor member 8 is supported by the swivel frame 5 via the floor support member 21, the vibration-damping member 22, the vibration-damping member bracket 12B, and the counterweight 12. That is, the front footrest portion 8A of the floor member 8 is elastically supported by the swivel frame 5 via the vibration-damping rubber 18C of the tilt support member 18, while the rear mounting plate portion 8E is elastically supported by the swivel frame 5 via the vibration-damping member 22 provided between the floor support member 21 and the vibration-damping member bracket 12B (counterweight 12).

[0040] As shown in Figure 5, the vibration isolation bracket 12B is provided on the upper side of the counterweight 12. The vibration isolation bracket 12B has a mounting portion 12B1 made of a substantially rectangular plate that is curved to follow the counterweight 12. The mounting portion 12B1 has two vibration isolation mounting holes 12B2 that are spaced apart in the longitudinal direction, to which the vibration isolation member 22 is attached. The vibration isolation bracket 12B is fixed to the counterweight 12 using bolts or the like (not shown). In this case, the vibration isolation bracket 12B is directly fixed to the counterweight 12 without the use of an elastic member. That is, the vibration isolation bracket 12B is part of the same vibration system as the counterweight 12 and the slewing frame 5.

[0041] As shown in Figures 4 and 5, the floor support member 21 is positioned above the vibration isolation member bracket 12B. The mounting plate portion 8E of the floor member 8 is attached to the floor support member 21 when the floor member 8 is tilted down. The floor support member 21 is made of a roughly rectangular plate extending in the left-right direction, and bolt mounting holes 21A are formed on both the left and right sides, corresponding to the vibration isolation member mounting holes 12B2 of the vibration isolation member bracket 12B. Bolts 22E that connect the vibration isolation member 22 between the floor support member 21 and the vibration isolation member bracket 12B are inserted through these bolt mounting holes 21A. The floor support member 21 is also provided with screw holes 21B (Figure 4) into which bolts (not shown) for fixing the mounting plate portion 8E of the floor member 8 to the floor support member 21 are screwed. The mounting plate portion 8E of the floor member 8 is fixed to the floor support member 21 in a removable manner using bolts that are screwed into the screw holes 21B of the floor support member 21.

[0042] The vibration-damping member 22 elastically supports the floor support member 21 on the vibration-damping member bracket 12B of the counterweight 12. The vibration-damping member 22 is composed of an upper elastic body 22A and a lower elastic body 22B as elastic members, a sleeve 22C, a stopper plate 22D, a bolt 22E and a nut 22F. The upper elastic body 22A is provided between the floor support member 21 and the vibration-damping member bracket 12B. The lower end of the upper elastic body 22A is fitted into the vibration-damping member mounting hole 12B2 of the vibration-damping member bracket 12B. The upper elastic body 22A is formed in a cylindrical shape using an elastic material such as rubber. The sleeve 22C and the bolt 22E are inserted inside the upper elastic body 22A.

[0043] The lower elastic body 22B is provided on the lower side of the vibration isolation bracket 12B. The upper end of the lower elastic body 22B is fitted into the vibration isolation mounting hole 12B2 of the vibration isolation bracket 12B. The lower elastic body 22B is paired with the upper elastic body 22A in the vertical direction, with the vibration isolation bracket 12B in between. The lower elastic body 22B is formed in a cylindrical shape using an elastic material such as rubber, similar to the upper elastic body 22A. The sleeve 22C is a cylindrical tube and is inserted through the upper elastic body 22A and the lower elastic body 22B. The sleeve 22C is fixed to the floor support member 21 by screwing a nut 22F onto a bolt 22E inserted through the inner circumference of the sleeve 22C.

[0044] Stopper plates 22D are positioned above the upper elastic body 22A and below the lower elastic body 22B. The stopper plates 22D are formed as U-shaped plates. The upper stopper plate 22D is sandwiched between the upper elastic body 22A and the floor support member 21. The lower stopper plate 22D is sandwiched between a nut 22F screwed onto a bolt 22E and the lower elastic body 22B.

[0045] The floor support member 21 is elastically attached to the vibration isolation member bracket 12B of the counterweight 12 via a vibration isolation member 22 which includes an upper elastic body 22A and a lower elastic body 22B. The vibration isolation member 22 absorbs and mitigates vibrations transmitted from the slewing frame 5 (counterweight 12) to the floor support member 21 (floor member 8) during operation of the hydraulic excavator 1, etc., through the elastic deformation of the upper elastic body 22A and the lower elastic body 22B. That is, the vibration isolation member 22 is positioned so as to sandwich the vibration isolation member bracket 12B of the counterweight 12 in the vertical direction between the upper elastic body 22A and the lower elastic body 22B. The vibration isolation member 22 is then fixed to the floor support member 21 based on the tightening of bolts 22E and nuts 22F. The mounting plate portion 8E of the floor member 8 is attached to the floor support member 21 using bolts or the like (not shown). As a result, the rear side of the floor member 8 is supported by the counterweight 12 and, consequently, the slewing frame 5 in a vibration-damped state.

[0046] Incidentally, Patent Documents 1 and 2, mentioned above, describe hydraulic excavators equipped with gas engines that use liquefied petroleum gas (LPG), natural gas (NG), etc., as fuel. Hydraulic excavators equipped with gas engines are equipped with gas containers (gas cylinders) for storing gas fuel. The gas containers are made of high-strength metal containers, and the inside of the gas containers is filled with, for example, liquid gas fuel. The gas supply section of the gas container is connected to the gas engine via a fuel supply line. Here, construction machinery such as hydraulic excavators vibrate considerably when traveling, digging, etc. In the case of the prior art, vibrations caused by traveling and digging operations of the hydraulic excavator may be directly transmitted to the gas container. Therefore, in this embodiment, in order to reduce the vibrations transmitted to the gas container 25, the gas container 25 is mounted on a vibration-damping supported floor member 8. This point will be explained below.

[0047] As shown in Figure 1, the hydraulic excavator 1, as a construction machine, comprises a lower traveling body 2 and an upper slewing body 3 as a movable vehicle body, and a work device 4 attached to the upper slewing body 3. As shown in Figures 2 to 8, the upper slewing body 3 comprises a slewing frame 5 as a vehicle frame to which the work device 4 is attached, a gas engine 13 mounted on the slewing frame 5, and a floor member 8 supported on the slewing frame 5 via vibration-damping rubber 18C, an upper elastic body 22A, and a lower elastic body 22B as elastic members. Furthermore, as shown in Figures 2 and 3, a gas container 25 for storing gas fuel for the gas engine 13 and a driver's seat 7 are mounted on the floor member 8.

[0048] Here, the gas container 25 is a sealed container that can be transported by hand and stores gas fuel such as LPG that is supplied to the gas engine 13. The gas container 25 is composed of a sealed cylindrical container body 25A, a cock 25B provided at the center of one end of the container body 25A in the longitudinal direction, a pair of semi-cylindrical protectors 25C provided on the container body 25A so as to surround the cock 25B, and a ring member 25D provided at the tip of the protectors 25C.

[0049] A hose (not shown) is connected to the cock 25B. That is, the cock 25B is connected to the gas engine 13 via a fuel supply line that includes the hose. The cock 25B adjusts the amount of gas fuel supplied to the gas engine 13. Multiple openings 25E are formed in the circumferential direction of the protector 25C, for example, in two locations facing each other radially on either side of the cock 25B. As a result, two locations on the ring member 25D corresponding to the openings 25E become handles 25F, and the worker carries the gas container 25 while gripping the handles 25F.

[0050] In this embodiment, the gas container 25 is positioned between the partition plate portion 8F of the floor member 8 (right side 9D of the cab box 9) and the exterior cover 16 (front cover 16C, partition cover 16D) formed to surround the hydraulic oil tank 15. In this case, the gas container 25 is mounted on the same member as the footrest portion 8A of the floor member 8 via a gas container mounting bracket 26. For this purpose, the floor member 8 includes a footrest portion 8A provided on the working device 4 side of the slewing frame 5, and a gas container mounting portion 8G as a first extension portion on which the gas container 25 is mounted, extending from the footrest portion 8A to the right side, which is the other side in the width direction of the slewing frame 5 (opposite side in the left-right direction from the entrance / exit where the operator enters and exits).

[0051] Furthermore, the floor member 8 includes a partition plate portion 8F that rises upward from the footrest portion 8A as a wall surface. As shown in Figure 8, the gas container mounting portion 8G is formed integrally with the floor member 8 as a roughly rectangular plate. The length dimension of the gas container mounting portion 8G in the front-rear direction is approximately equal to the total length of the gas container 25. The gas container mounting portion 8G is located on the opposite side of the driver's seat 7, with the partition plate portion 8F in between. As a result, the gas container 25 is located to the side of the driver's seat 7 (on the right side, opposite in the left-right direction from the entrance / exit where the operator enters and exits). In other words, the gas container 25 is located on the opposite side of the driver's seat 7, with the partition plate portion 8F in between.

[0052] The gas container 25 is mounted on a gas container mounting bracket 26 provided on the floor member 8 (gas container mounting section 8G) in a manner that allows for attachment and removal. The gas container mounting bracket 26 comprises a mounting base 27 on which the gas container 25 is attached, and a sliding mechanism 28 that moves the mounting base 27 relative to the floor member 8 (gas container mounting section 8G). The sliding mechanism 28 moves (slides) the mounting base 27 toward the outside of the pivot frame 5. The mounting base 27 is provided with a through hole 31 (Figure 11) that penetrates the mounting base 27 in the vertical direction.

[0053] This gas container mounting bracket 26 will be described with reference to Figures 2, 3, 9, 10, and 11.

[0054] The gas container mounting bracket 26 is provided on the gas container mounting section 8G of the floor member 8. The gas container mounting bracket 26 comprises a mounting base 27 and a sliding mechanism 28 that moves the gas container 25 horizontally relative to the gas container mounting section 8G, more specifically in the front-rear direction of the swivel frame 5, together with the mounting base 27. The gas container mounting bracket 26 also includes a fixing band 29 and a fixing hook 30 for attaching and detachably securing the gas container 25 to the mounting base 27.

[0055] The gas container mounting bracket 26 is configured such that the mounting base 27 can be moved to a position that facilitates the installation and removal of the gas container 25 by means of a sliding mechanism 28. In other words, the installation and removal of the gas container 25 can be performed with the mounting base 27 moved to the front of the swivel frame 5 by the sliding mechanism 28. As will be described later, the gas container 25 is fixed to the gas container mounting bracket 26 by being restrained to the mounting base 27 by a fixing band 29 and a fixing hook 30.

[0056] Here, the slide mechanism 28 is attached to the upper surface of the gas container mounting section 8G of the floor member 8. Specifically, the slide mechanism 28 has a pair (two rows) of rails 28A fixed to the upper surface of the gas container mounting section 8G, and a pair (two rows) of sliders 28C that move along the rails 28A. The pair of rails 28A have the same length in the front-to-back direction as the gas container mounting section 8G, are fixed to the upper surface of the gas container mounting section 8G while maintaining a constant distance in the left-to-right direction, and extend in the front-to-back direction. On the upper surface of the pair of rails 28A, a groove-shaped notch 28B is formed with an open top over the entire length.

[0057] The pair of sliders 28C have the same length in the front-to-back direction as the rail 28A and extend in the front-to-back direction while being movably mounted on the upper surface of the rail 28A. A linear projection 28D extending in the front-to-back direction is provided on the lower side of the pair of sliders 28C, and this projection 28D is slidably fitted into a notch 28B of the rail 28A. In addition, the legs 27A of the mounting base 27 are fixed to the upper side of the pair of sliders 28C. Therefore, the sliders 28C of the sliding mechanism 28 move in the front-to-back direction along the rail 28A together with the mounting base 27 by fitting the projection 28D into the notch 28B of the rail 28A.

[0058] The mounting base 27 is attached to the slider 28C of the slide mechanism 28. The mounting base 27 consists of a leg portion 27A fixed to the upper surface of the slider 28C of the slide mechanism 28, and a support portion 27B fixed to the upper side of the leg portion 27A and supporting the gas container 25 in a horizontal position. The leg portion 27A includes a lower fixing plate 27A1 that is fixed to the upper surface of the slider 28C by welding or the like and extends in the front-rear direction, a rising plate 27A2 that extends in the front-rear direction similar to the lower fixing plate 27A1 and rises upward from the lower fixing plate 27A1, and an upper fixing plate 27A3 that extends in the front-rear direction similar to the rising plate 27A2 and extends diagonally upward from the upper end of the rising plate 27A2 in a direction that contacts the circumferential surface of the gas container 25.

[0059] The lower fixing plate 27A1, the rising plate 27A2, and the upper fixing plate 27A3 that constitute the leg portion 27A are integrally formed by bending a plate material. The lower surface of the support portion 27B is fixed to the upper fixing plate 27A3. As shown in Figures 9 and 10, the lower surface of the upper fixing plate 27A3 is provided with hooks 27A4 at three positions spaced apart in the front-rear direction, for which the attachments 29B of the fixing band 29 are hooked.

[0060] The support portion 27B is formed as a valley-shaped plate that is recessed downwards as a whole. Specifically, the support portion 27B comprises a bottom portion 27B1 extending in the front-rear direction, and a pair of plate portions 27B2 that extend in the front-rear direction similar to the bottom portion 27B1, and also extend diagonally upwards away from the bottom portion 27B1. The plate portions 27B2 are fixed to the upper fixing plate 27A3 of the leg portion 27A by welding or the like. The bottom portion 27B1 of the support portion 27B is provided with a plurality of through holes 31 that are spaced apart in the longitudinal direction and penetrate vertically. In addition, the plate portions 27B2 of the support portion 27B and the upper fixing plate 27A3 of the leg portion 27A are also provided with a plurality of through holes 31 that are spaced apart in the longitudinal direction and penetrate vertically. The through holes 31 serve as drainage holes for the mounting base 27 (support portion 27B).

[0061] Multiple fixing bands 29 are provided, spaced apart in the front-rear direction (for example, three). Each fixing band 29 has a belt portion 29A that is wrapped around the outer circumference of the gas container 25, and attachment devices 29B provided at both ends of the belt portion 29A that engage with hooks 27A4 on the mounting base 27 (leg portions 27A). With the gas container 25 placed on the mounting base 27, the fixing band 29 is positioned by placing the belt portion 29A over the gas container 25 and engaging the attachment devices 29B with the hooks 27A4. As a result, the gas container 25 is restrained to the mounting base 27 by the fixing band 29.

[0062] The fixing hook 30 connects the handle 25F of the gas container 25 to the gas container mounting section 8G. The fixing hook 30 is formed as a J-shaped rod, with one end (upper end) being a hook portion 30A that hooks onto the handle 25F of the gas container 25, and the other end (lower end) being a male thread 30B that is inserted into a fixing hole (not shown) of the gas container mounting section 8G and to which a fixing nut 30C is screwed.

[0063] As shown in Figure 3, the gas container 25 is restrained by a fixing band 29 on the mounting base 27 of the gas container mounting bracket 26, and is moved to the rear side in the front-rear direction of the swivel frame 5 by the sliding mechanism 28. In this state, as shown in Figures 2 and 10, the male thread 30B of the fixing hook 30 is inserted through the fixing hole of the gas container mounting section 8G, the hook portion 30A is engaged with the handle 25F of the gas container 25, and the fixing nut 30C is screwed onto the male thread 30B. This restricts the gas container 25 from moving to the front side in the front-rear direction of the swivel frame 5 together with the mounting base 27 by the sliding mechanism 28.

[0064] Specifically, the gas container 25 is restrained to the mounting base 27 by a fixing band 29 and connected to the gas container mounting section 8G by a fixing hook 30, thereby restricting its movement by the sliding mechanism 28 and allowing it to be placed on the gas container mounting section 8G. As a result, the gas container 25 is stably supported on the gas container mounting section 8G of the floor member 8 by the gas container mounting bracket 26. On the other hand, when replacing the gas container 25, the fixing nut 30C is removed from the male thread 30B of the fixing hook 30, and the fixing hook 30 is removed from the gas container 25 and the gas container mounting section 8G.

[0065] Then, the sliding mechanism 28 moves the mounting base 27 to the front side in the front-rear direction of the swivel frame 5. In this state, the fixing band 29 can be removed from the mounting base 27, allowing the gas container 25 to be removed from the gas container mounting bracket 26. After removing the gas container 25 that was previously in use, the new gas container 25 is attached to the mounting base 27. In this state, the fixing band 29 is used to restrain the gas container 25 to the mounting base 27. Then, the sliding mechanism 28 moves the gas container 25 together with the mounting base 27 to the rear side in the front-rear direction of the swivel frame 5, and the fixing hook 30 connects the handle 25F of the gas container 25 to the floor member 8 (gas container mounting section 8G).

[0066] As described above, according to this embodiment, the gas container 25 is placed on the floor member 8 (gas container mounting section 8G) via the gas container mounting bracket 26. At this time, the gas container 25 is fixed to the mounting base 27 of the gas container mounting bracket 26 by a fixing band 29. The gas container mounting bracket 26 comprises a mounting base 27, a sliding mechanism 28, a fixing band 29, and a fixing hook 30. The gas container mounting bracket 26 is fixed by welding the rail 28A of the sliding mechanism 28 to the floor member 8 (gas container mounting section 8G), or by fastening it with bolts and nuts.

[0067] The gas container 25 is restricted from moving in the front-to-back direction by attaching the fixing hook 30 to the handle 25F of the gas container 25 and tightening the fixing nut 30C of the fixing hook 30 together with the floor member 8 (gas container mounting section 8G). Furthermore, the fixing band 29 is attached to the hook 27A4 of the mounting base 27, and its own tension presses the gas container 25 against the mounting base 27. In addition, the mounting base 27 is provided with a through hole 31 that serves as a drain hole, which prevents water from accumulating on the mounting surface of the gas container 25.

[0068] The hydraulic excavator 1 according to this embodiment has the configuration described above, and its operation will now be explained.

[0069] When performing excavation work using the hydraulic excavator 1, the gas container 25 is positioned by a fixing hook 30 at the container fixing position on the rear side (towards the center of the slewing frame 5) in the front-rear direction of the slewing frame 5. In this state, the operator boards the cab box 9 and operates the gas engine 13. When the operator operates the travel lever / pedal 10, pressurized oil is supplied from the hydraulic pump 14 to the travel hydraulic motor of the lower travel body 2 via the control valve device. This allows the hydraulic excavator 1 to move. Also, when the operator operates the work lever 11, pressurized oil is supplied from the hydraulic pump 14 to the slewing hydraulic motor, swing cylinder, boom cylinder 4E, arm cylinder 4F, and bucket cylinder 4G via the control valve device. This allows the upper slewing body 3 to rotate while excavation work such as soil and sand is performed using the work device 4.

[0070] Next, when replacing the gas container 25 with a new one to replenish the gas fuel, the fixing hook 30 connecting the mounting base 27 of the gas container mounting bracket 26 and the floor member 8 (gas container mounting section 8G) is removed. Then, the sliding mechanism 28 moves the gas container 25 together with the mounting base 27 to the container removal position, which is on the front side (outside: the side away from the center of the slewing frame 5) in the front-rear direction of the slewing frame 5. At this time, since the gas container 25 is fixed to the mounting base 27 by the fixing band 29, the gas container 25 can be stably moved to the container removal position together with the mounting base 27.

[0071] Once the gas container 25 is moved to the container removal position, the fixing band 29 is removed from the mounting base 27, and the gas container 25 is removed from the mounting base 27. Then, the new gas container 25 to be replaced is placed on the mounting base 27, and the fixing band 29 is wrapped around the gas container 25 and hooked onto the hook 27A4 of the mounting base 27. This restrains the gas container 25 on the mounting base 27. In this state, the sliding mechanism 28 moves the gas container 25 together with the mounting base 27 to the container fixing position, which is on the rear side (center side of the swivel frame 5) in the front-rear direction of the swivel frame 5. Once the gas container 25 has been moved to the container fixing position, the handle 25F of the gas container 25 and the floor member 8 (gas container mounting section 8G) are connected by the fixing hook 30.

[0072] In this embodiment, the gas container 25 and the driver's seat 7 are mounted on a floor member 8, which is supported by vibration-damping rubber 18C, an upper elastic body 22A, and a lower elastic body 22B on the slewing frame 5. That is, the gas container 25 is mounted together with the driver's seat 7 on the floor member 8, which is vibration-damped and supported by vibration-damping rubber 18C, an upper elastic body 22A, and a lower elastic body 22B on the slewing frame 5. Therefore, the gas container 25 is vibration-damped and supported together with the driver's seat 7. As a result, vibrations of the gas container 25 can be suppressed even when the hydraulic excavator 1 travels on rough roads. In other words, the vibration load on the gas container 25 can be reduced. Moreover, since the gas container 25 is in the same vibration system as the driver's seat 7, the operator can feel the same vibrations as those applied to the gas container 25. Therefore, when the operator feels a large vibration due to collision, interference, etc., of the work equipment 4 during work, they can quickly recognize that a large vibration has been applied to the gas container 25. Subsequently, the operator can check the condition of the gas container 25 to prevent continued operation in a state of malfunction caused by significant vibration to the gas container 25.

[0073] According to this embodiment, the gas container 25 is placed on the gas container mounting section 8G that extends in the width direction of the swivel frame 5 from the footrest section 8A of the floor member 8. Therefore, the gas container 25 can be stably vibration-damped and supported on the gas container mounting section 8G that extends from the footrest section 8A.

[0074] According to this embodiment, the gas container 25 is positioned to the side of the driver's seat 7. This improves the visibility of the gas container 25 from the operator's perspective.

[0075] According to this embodiment, the gas container 25 is positioned on the opposite side of the driver's seat 7 from the partition plate portion 8F of the floor member 8. Therefore, the space between the operator and the gas container 25 can be separated by the partition plate portion 8F. In addition, the operator can see the gas container 25 through the partition plate portion 8F.

[0076] According to this embodiment, the gas container 25 is attached to the gas container mounting bracket 26. Therefore, the gas container 25 can be stably supported on the floor member 8 using the gas container mounting bracket 26.

[0077] According to the embodiment, the mounting base 27 to which the gas container 25 is attached is provided with a sliding mechanism 28 that moves relative to the floor member 8. Therefore, when replacing (installing or removing) the gas container 25, the mounting base 27 can be moved relative to the floor member 8, making it easier to replace the gas container 25.

[0078] According to this embodiment, the sliding mechanism 28 moves (slides) the mounting base 27 toward the outside of the swivel frame 5 (towards the side away from the center of the swivel frame 5). Therefore, the gas container 25 can be replaced with the mounting base 27 moved toward the outside of the swivel frame 5. This makes it easy to replace the gas container 25.

[0079] According to this embodiment, the mounting base 27 is provided with a through hole 31. This prevents rainwater and other liquids from accumulating on the mounting base 27 and improves drainage around the gas container 25.

[0080] In this embodiment, the gas container 25 was described as being placed on a gas container mounting section 8G extending from the footrest section 8A of the floor member 8. However, the configuration is not limited to this, and for example, it may be placed on the mounting plate section 8E of the floor member 8, or on a gas container mounting section extending (for example, to the rear) from the mounting plate section 8E.

[0081] In the embodiment, the example described was one in which the gas container 25 is placed on a gas container mounting section 8G extending from the footrest section 8A of the floor member 8. However, the embodiment is not limited to this, and for example, the gas container may be placed on a gas container mounting section extending from the footrest section 8A of the floor member 8 toward the front (towards the work device 4). That is, the floor member may be configured to include a footrest section provided on the work device side of the vehicle frame, and a second extension (gas container mounting section) extending from the footrest section toward the work device side on which the gas container is placed.

[0082] In this case, the gas container is placed on a second extension (gas container mounting section) that extends from the footrest portion of the floor member towards the work device. Therefore, the gas container can be stably vibration-damped and supported on the second extension (gas container mounting section) extending from the footrest portion. The extension (gas container mounting section) may be an integral part of the floor member, or it may be a separate part that is fixed to the floor member.

[0083] In this embodiment, the gas container 25 is described as being mounted on a gas container mounting bracket 26 provided on the floor member 8 (gas container mounting section 8G). That is, in this embodiment, the gas container 25 is mounted on the floor member 8 (gas container mounting section 8G) via the gas container mounting bracket 26. However, this is not the only option, and for example, the gas container may be mounted directly on the floor member (gas container mounting section) without using the gas container mounting bracket. Alternatively, the gas container may be mounted directly on a member directly fixed to the floor member, i.e., on a member of the same vibration system as the floor member, or via the gas container mounting bracket. In any case, it is preferable to mount the gas container on the floor member in a way that allows for easy attachment and removal.

[0084] In this embodiment, a hydraulic excavator 1 equipped with a swing-type working device 4 was used as an example. However, the invention is not limited to this, and can be applied to hydraulic excavators equipped with other types of working devices (front devices), such as a hydraulic excavator equipped with a monoboom type working device or a hydraulic excavator equipped with an offset type working device. Furthermore, although the invention was explained using the example where the working tool of the working device 4 is a bucket 4D, a working device equipped with other working tools, such as a crusher, may also be used.

[0085] In this embodiment, a hydraulic excavator 1 with a cab box 9 was used as an example. However, the invention is not limited to this, and for example, a hydraulic excavator with a canopy may also be used.

[0086] In this embodiment, a small hydraulic excavator 1 was used as an example for explanation, but it may also be applied to medium-sized or larger hydraulic excavators. Furthermore, although the example of a vehicle body consisting of a lower traveling body 2 and an upper rotating body 3 was used for explanation, a vehicle body without a rotating body (for example, an articulated vehicle body in which a front vehicle body having front wheels and a rear vehicle body having rear wheels are flexibly connected via a connecting shaft) may also be used.

[0087] In this embodiment, a hydraulic excavator 1 was used as an example of construction machinery for explanation, but the invention is not limited to this and can be broadly applied to various types of construction machinery, such as wheel loaders. [Explanation of symbols]

[0088] 1. Hydraulic excavator (construction machinery) 2. Lower running body (vehicle body) 3. Upper rotating body (vehicle body) 4. Working equipment 5. Swivel frame (vehicle frame) 7. Driver's seat 8 Floor components 8A Footrest 8F Partition Panel Section (Wall Section) 8G Gas container mounting section (first extension) 13 Gas engine 18C Vibration-damping rubber (elastic material) 22A Upper elastic body (elastic member) 22B Lower elastic body (elastic member) 25 gas containers 26 Gas container mounting bracket 27 Mounting base 28. Slide mechanism 31 Through hole

Claims

1. It has a drivable vehicle body and a work device attached to the vehicle body, The aforementioned vehicle body is The vehicle frame to which the aforementioned work device is attached, A gas engine mounted on the aforementioned vehicle frame, In a construction machine comprising a floor member supported on the vehicle body frame via an elastic member, The floor member is equipped with a gas container for storing the gas fuel of the gas engine and a driver's seat. The floor member is A footrest portion provided on the side of the vehicle body frame that is on the work device side, A construction machine characterized by comprising a gas container mounting section extending from the footrest section toward the work device side and on which the gas container is placed.

2. A vehicle having a drivable body and a work device attached to the vehicle body, The aforementioned vehicle body is The vehicle frame to which the aforementioned working device is attached, A gas engine mounted on the aforementioned vehicle frame, A construction machine comprising a floor member supported on the vehicle frame via a plurality of support members having elastic members, The floor member is The driver's seat mounting section where the driver's seat is installed, A footrest provided on the side of the work device than the driver's seat mounting portion, Extending from the footrest portion in the width direction of the vehicle frame, a gas container mounting portion is provided on which a gas container for storing gas fuel for the gas engine is placed. Equipped with, The plurality of support members include support members that support the gas container mounting portion to the vehicle frame below the gas container mounting portion, The construction machine is characterized in that the gas container is mounted on a gas container mounting bracket provided on the gas container mounting section in a manner that allows it to be attached to and removed.

3. The aforementioned gas container mounting bracket is The mounting base to which the gas container is attached, The construction machine according to claim 2, further comprising a sliding mechanism for moving the mounting base relative to the floor member.

4. The construction machine according to claim 3, characterized in that the sliding mechanism moves the mounting base toward the outside of the vehicle frame.

5. The construction machine according to claim 3, characterized in that the mounting base is provided with a through hole that penetrates the mounting base in the vertical direction.

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