JP2020164032A - Work machine - Google Patents

Abstract

To improve flexibility of a mounting position of an inching valve.SOLUTION: A work machine includes: a machine body; a travel device which supports the machine body in a runnable manner; a hydraulic drive device which drives the travel device with an oil pressure; a floor frame supported through a mount member on the machine body; a pedal for performing braking operation of the travel device; an inching valve which changes a flow rate of a hydraulic fluid to be supplied to the hydraulic drive device according to an operation of the pedal; and a cable linking the pedal to the inching valve. The pedal and the inching valve are attached to the floor frame.SELECTED DRAWING: Figure 13

Description

The present invention relates to a working machine such as a wheel loader.

Conventionally, a working machine disclosed in Patent Document 1 is known.
The working machine disclosed in Patent Document 1 discharges a hydraulic drive device that hydraulically drives a traveling device and hydraulic oil that controls the hydraulic drive device by stepping on a pedal to a hydraulic oil tank, and exerts a braking force on the hydraulic drive device. Has an inching valve that gives. The inching valve is provided directly under the pedal, and the spool of the inching valve is interlocked with the pedal.

Japanese Unexamined Patent Publication No. 2012-224213

By the way, depending on the support structure of the pedal, it may be difficult to arrange the inching valve directly under the pedal due to space limitations.
Therefore, in view of the above problems, it is an object of the present invention to increase the degree of freedom in the mounting position of the inching valve.

The working machine according to one aspect of the present invention is supported by a machine body, a traveling device that supports the machine body so as to be travelable, a hydraulic drive device that hydraulically drives the traveling device, and a mounting member. The floor frame, a pedal for braking the traveling device, an inching valve that changes the flow rate of hydraulic oil supplied to the hydraulic drive device according to the operation of the pedal, and the pedal and the inching valve. The pedal and the inching valve are attached to the floor frame with an interlocking cable.

According to the above configuration, by interlocking the pedal and the inching valve with a cable, the degree of freedom in the mounting position of the inching valve can be increased. Further, by attaching the pedal and the inching valve to the floor frame supported by the machine body via the mounting member, that is, by attaching to the same vibration system, the inching valve is suppressed from being affected by running vibration and working vibration. can do.

It is a side view of a working machine. It is a top view of a working machine. It is a perspective view of the rear part of a working machine. It is a perspective view of a cabin frame. It is a perspective view of the front part of a cabin. It is a right side view of the cabin. It is a perspective view of the attachment part of a blocking member. It is a perspective view of the attachment part of the rear part of a blocking member. It is a perspective view of the blocking member seen from the driver's seat side. It is a perspective view of the floor frame seen from the upper part of the back. It is a perspective view which looked at the floor frame from the front. It is a front view of the support structure of a brake pedal. It is a perspective view of the support structure of a brake pedal. It is sectional drawing of the support structure of a brake pedal. It is a perspective view which shows the relationship between a brake arm and a cable. It is a block diagram which shows the mounting part of an inching valve and the hydraulic circuit of a traveling system. It is a side view of the mounting part of an inching valve. It is a perspective view of the mounting part of an inching valve. It is a front perspective view of a cabin room. It is a perspective view of the rear part of a floor frame. It is sectional drawing of the inside / outside air switching part. It is sectional drawing of the filter accommodating part. It is sectional drawing of the rear part of the fuselage. It is sectional drawing of the inside and outside air introduction part.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
FIG. 1 is a schematic side view showing the overall configuration of the work machine 1 according to the present embodiment. FIG. 2 is a schematic plan view of the working machine 1. In this embodiment, the wheel loader is exemplified as the working machine 1.
As shown in FIGS. 1 and 2, the wheel loader of the present embodiment is an articulated work machine 1, and the machine 2 of the work machine 1 is composed of a front machine 2A and a rear machine 2B. .. The front fuselage 2A is provided with a left front wheel 3L and a right front wheel 3R. The front wheels 3L are provided on the left side of the front airframe 2A, and the front wheels 3R are provided on the right side of the front airframe 2A. The rear fuselage 2B is provided with a left rear wheel 4L and a right rear wheel 4R. The rear wheels 4L are provided on the left side of the rear fuselage 2B, and the rear wheels 4R are provided on the right side of the rear fuselage 2B. The front wheels 3L, 3R and the rear wheels 4L, 4R form a part of the traveling device 17 that supports the body 2 so as to travel. The rear fuselage 2B is equipped with a driver's seat (seat) 13 on which an operator (driver) is seated. The driver's seat 13 is arranged between the rear wheels 4L and the rear wheels 4R, and is provided at the center of the airframe 2 in the airframe width direction K2.

In the present embodiment, the front side of the operator seated in the driver's seat 13 (direction of arrow A1 in FIGS. 1 and 2) is forward, the rear side of the operator (direction of arrow A2 in FIGS. 1 and 2) is rear, and the left side of the operator. (The front side of FIG. 1, the direction of the arrow B1 of FIG. 2) will be described as the left side, and the right side of the operator (the back side of FIG.
Further, the horizontal direction, which is a direction orthogonal to the front-rear direction K1 of the machine body, will be described as the body width direction K2 (see FIG. 2). Further, the direction from the central portion in the width direction of the airframe 2 toward the right or left will be described as the outside of the airframe. That is, the outside of the airframe is a direction away from the center of the airframe 2 in the airframe width direction K2. The direction opposite to the outside of the aircraft will be described as the inside of the aircraft. That is, the inside of the machine is a direction approaching the center of the body 2 in the body width direction K2.

As shown in FIG. 1, an airframe connecting member 5 is provided on the front end side of the rear airframe 2B so as to be rotatable within a predetermined range around the axis of the airframe front-rear direction K1, and the airframe connecting member 5 is provided with the rear end of the front airframe 2A. The side is swingably connected in the width direction K2 of the machine body around the vertical axis (axis center extending in the vertical direction).
A steering cylinder 6 composed of a hydraulic cylinder is provided over the airframe connecting member 5 and the front airframe 2A. By expanding and contracting the steering cylinder 6, the front machine 2A swings in the machine width direction K2 with respect to the rear machine 2B, and the work machine 1 can turn left and right.

The rear aircraft 2B is provided with a cabin 14 as a driver's seat protection device surrounding the driver's seat 13. Inside the cabin 14, a steering wheel 15 (steering wheel) for operating the steering cylinder 6 and a steering lever 16 for operating the working device 7 are provided. The steering wheel 15 is arranged in front of the driver's seat 13, and the control lever 16 is arranged on the side (right side) of the driver's seat 13.

In the following description, the interior of the cabin 14 is referred to as the cabin interior, and the outdoor of the cabin 14 is referred to as the cabin outdoor.
As shown in FIG. 1, the prime mover 352 is mounted on the rear fuselage 2B. The prime mover 352 is, for example, a diesel engine. Further, as the driver's seat protection device, a canopy may be used instead of the cabin 14.

As shown in FIGS. 1 and 2, a work device 7 (front work device) is provided on the front machine body 2A. The working device 7 has a lift arm 8 that is vertically swingably supported by the front machine body 2A (body body 2). The lift arm 8 has a left first arm 8L and a right second arm 8R arranged at intervals in the body width direction K2. The first arm 8L is rotatably supported around the axis extending in the width direction of the machine K2 on the upper part of the first support frame 10L whose base end side (rear end side) is erected on the left side of the front body 2A. ing. Therefore, the first arm 8L can swing up and down. The second arm 8R is rotatably supported around the axis extending in the width direction of the machine body K2 on the upper part of the second support frame 10R whose base end side is erected on the right side of the front body body 2A. Therefore, the second arm 8R can also swing up and down. A work light (light) 33L is provided on the left side of the upper part of the first support frame 10L. A work light 33R is also provided on the upper right side of the second support frame 10R.

As shown in FIG. 5, the first arm 8L and the second arm 8R are provided at intervals in the body width direction K2 so as to gradually widen as the intervals go forward. As a result, the visibility of the operator seated in the driver's seat 13 diagonally forward to the left and diagonally forward to the right is improved. As a result, the front wheels 3L and the front wheels 3R can be easily confirmed. Therefore, the work while looking at the front wheels 3L and the front wheels 3R can be easily performed. In addition, the work can be performed while looking at the portion of the work tool 9 on the outer side of the machine body. For example, when the pallet fork is attached as the work tool 9, it is possible to work while looking at the toes of the pallet fork.

As shown in FIGS. 1 and 2, the first arm 8L and the second arm 8R are connected by a connecting pipe 26 provided in the middle of the lift arm 8 in the longitudinal direction.
As shown in FIG. 1, a lift cylinder 11L is provided over a middle portion in the longitudinal direction of the first arm 8L and a middle portion in the vertical direction of the first support frame 10L. A lift cylinder 11R is provided over a halfway portion in the longitudinal direction of the second arm 8R and a middle portion in the vertical direction of the second support frame 10R. The lift cylinder 11L and the lift cylinder 11R are composed of a double-acting hydraulic cylinder. By expanding and contracting the lift cylinder 11L and the lift cylinder 11R, the lift arm 8 swings up and down (the first arm 8L and the second arm 8R simultaneously).

As shown in FIGS. 1 and 2, the working device 7 has a working tool 9 that is detachably attached to the front portion of the lift arm 8. The work tool 9 is equipped with a bucket as standard equipment, and instead of the bucket, a work tool (attachment) such as a pallet fork or a mania fork or a work tool (hydraulic attachment) having a hydraulic actuator such as a sweeper, a mower, or a breaker is used. It can be installed. The lower part of the back surface of the work tool 9 is connected to and pivotally supported on the tip end side (front end side) of the lift arm 8.

As shown in FIG. 1, the working machine 1 has a working tool cylinder 12 for driving the working tool 9. The work tool cylinder 12 is composed of a double-acting hydraulic cylinder. Further, a bracket member 27 is fixed to the connecting pipe 26, and a midway portion of the swing link 28 in the vertical direction is pivotally supported by the bracket member 27. One end of the work tool cylinder 12 is connected to the upper part of the swing link 28. The other end of the work tool cylinder 12 is pivotally supported by a bracket member 30 provided on a connecting member 29 that connects the first support frame 10L and the second support frame 10R (see FIG. 12). The rear part of the interlocking link 31 is pivotally supported at the lower part of the swing link 28. The front portion of the interlocking link 31 is pivotally supported (engaged) with the upper portion of the back surface of the work tool 9. By expanding and contracting the work tool cylinder 12, the swing link 28 swings and the interlocking link 31 moves back and forth. As a result, the work tool 9 swings up and down about the connection point with the lift arm 8.

The front wheels 3L are provided in front of the first support frame 10L and to the left of the first arm 8L. Further, the front wheel 3L is located behind the left portion of the work tool 9. The front wheels 3R are provided in front of the second support frame 10R and to the right of the second arm 8R. Further, the front wheel 3R is located behind the right portion of the work tool 9.
As shown in FIG. 3, the rear airframe 2B has an airframe frame 71. The airframe frame 71 is supported by the rear wheels 4L and the rear wheels 4R so as to be travelable. An airframe connecting member 5 is attached to the front portion of the airframe frame 71. As shown in FIG. 1, a bonnet 301 that covers the prime mover 352 from above and a weight 302 that is arranged below the bonnet 301 are provided at the rear portion of the airframe frame 71. As shown in FIG. 19, the bonnet 301 and the weight 302 form a prime mover room (engine room) E1 for accommodating the prime mover 352.

As shown in FIGS. 3 to 5B, the cabin 14 has a mounting member 303 having an elastic material. A plurality of mount members 303 are provided. In the present embodiment, four mount members (first mount member 303A, second mount member 303B, third mount member 303C, fourth mount member 303D) are provided.
The first mount member 303A is provided at the lower end of the left front portion of the cabin 14, and the second mount member 303B is provided at the lower end of the right front portion of the cabin 14. The third mount member 303C is provided at the lower end of the left rear portion of the cabin 14, and the fourth mount member 303D is provided at the lower end of the right rear portion of the cabin 14. The cabin 14 is mounted on the airframe frame 71 (airframe 2) via a mounting member 303, and is vibration-proof supported by the airframe frame 71.

As shown in FIG. 4, the cabin 14 has a cabin frame 304 constituting a skeleton. The cabin frame 304 has a plurality of front columns (first front column 142L, second front column 142R) and a plurality of rear columns (first rear column 305L, second rear column 305R).
As shown in FIG. 4, the first front support 142L is provided on the left side of the front part of the cabin 14. Specifically, the first front column 142L is arranged in front of the driver's seat 13 and on the left side (one side) (see FIG. 5A). The second front support 142R is provided on the right side of the front part of the cabin 14. Specifically, the second front support column 142R is arranged in front of and to the right side (other side) of the driver's seat 13 (see FIG. 5A). The first rear strut 305L is provided behind the first front strut 142L. Specifically, the first rear support column 305L is arranged in the middle portion of the aircraft front-rear direction K1 on the left side surface of the cabin 14. The second rear strut 305R is provided behind the second front strut 142R. Specifically, the second rear support column 305R is arranged in the middle portion of the aircraft front-rear direction K1 on the right side surface of the cabin 14.

As shown in FIG. 4, the lower end of the first rear strut 305L is formed at a position higher than the lower end of the first front strut 142L. The first rear strut 305L is connected to the first front strut 142L by the first inclined frame 306L and the first connecting frame 307L. The first inclined frame 306L extends from the lower end of the first rear strut 305L in a downwardly inclined direction. The first connecting frame 307L extends forward from the lower end of the first inclined frame 306L and is connected to the lower end of the first front column 142L.

As shown in FIG. 5B, the lower end of the second rear strut 305R is formed at a position higher than the lower end of the second front strut 142R. The second rear strut 305R is connected to the second front strut 142R by the second inclined frame 306R and the second connecting frame 307R. The second inclined frame 306R extends from the lower end of the second rear support column 305R in the downwardly inclined direction. The second connecting frame 307R extends forward from the lower end of the second inclined frame 306R and is connected to the lower end of the second front support 142R.

As shown in FIG. 4, the cabin frame 304 has a first upper frame 308L extending rearward from the upper end of the first front support 142L. The first upper frame 308L is connected to the upper end of the first rear strut 305L and extends rearward from the first rear strut 305L.
As shown in FIG. 5B, the cabin frame 304 has a second upper frame 308R extending rearward from the upper end of the second front support 142R. The second upper frame 308R is connected to the upper end of the second rear strut 305R and extends rearward from the second rear strut 305R.

As shown in FIG. 4, the openings formed by the first front strut 142L, the first rear strut 305L, the first inclined frame 306L, the first connecting frame 307L and the first upper frame 308L are the entrances for the operator to get on and off. Boarding / alighting passage) 309. That is, a passage for getting on and off is provided on the left side (one side) of the driver's seat 13. Therefore, the first front support column 142L forms the front part of the entrance / exit 309, and the first rear support column 305L forms the rear part of the entrance / exit 309.

As shown in FIG. 1, the entrance / exit 309 is closed by an entrance / exit door (door) 172 so as to be openable / closable. Specifically, the boarding / alighting door 172 is provided between the first front strut 142L and the first rear strut 305L, and is rotatably supported by a hinge member on the first rear strut 305L around the vertical axis. On the left side surface of the cabin 14, an boarding / alighting step 311 and a handrail 312 are provided to assist the operator in getting on / off the cabin 14. The boarding / alighting step 311 is provided below the boarding / alighting door 172. As shown in FIG. 4, the handrail 312 is provided on the first front support 142L and the first rear support 305L. The boarding / alighting door 172 includes a panel 172A having a light transmissive property. For example, panel 172A is made of a transparent glass plate. The panel 172A is formed in a size and shape that covers the entrance / exit 309. Further, the entrance / exit door 172 has a frame member (not shown) provided inside the panel 172A and formed of a rod-shaped member such as a pipe material.

As shown in FIG. 5B, the cabin 14 has an opening formed on the right side surface by a second front support 142R, a second rear support 305R, a second inclined frame 306R, a second connecting frame 307R, and a second upper frame 308R. It has an open portion) 313. As shown in FIG. 3, the opening 313 is closed by a door 314 so as to be openable and closable. Specifically, the door 314 is provided between the second front strut 142R and the second rear strut 305R, and is rotatably supported by the hinge member 315 on the second rear strut 305R around the vertical axis. Therefore, when the door 314 is opened from the state where the opening 313 is closed, the space on the floor portion 75 in front of the driver's seat 13 and the outside of the machine body 2 communicate with each other through the opening 313. The door 314 also includes a panel 314A that is transparent to light. For example, panel 314A is made of a transparent glass plate. The panel 314A is formed in a size and shape that covers the opening 313. Further, the door 314 has a frame member 316 provided inside the panel 314A and formed of a rod-shaped member such as a pipe material (see FIG. 7B).

By opening the door 314, it is possible to put things in and out of the cabin room from the side opposite to the entrance / exit 309, and to clean the cabin room. Further, in the present embodiment, the lower end of the opening 313 has a height equal to or lower than the upper surface of the floor portion 75 (see FIG. 8A) or the upper surface of the rubber mat 332 laid on the floor portion 75. As a result, dust and the like on the floor portion 75 or the rubber mat 332 can be easily swept out. Further, since the main portion of the door 314 is the panel 314A having light transmission, the visibility on the right side of the cabin 14 can be improved.

As shown in FIG. 3, a front panel 141 is provided at the upper portion and a cover panel 147 is provided at the lower portion between the first front support column 142L and the second front support column 142R. The front panel 141 is formed of a transparent glass plate or the like and has light transmissivity. The cover panel 147 is formed of an opaque member. A roof 317 is provided between the first upper frame 308L and the second upper frame 308R. A rear panel 318, which is formed of a transparent glass plate or the like and has light transmissivity, is provided at the rear portion of the cabin frame 304. The rear panel covers the rear side surface and the back surface of the cabin frame 304.

As shown in FIG. 5B, the driver's seat 13 has a seat portion 13A and a backrest portion 13B. The seat portion 13A is a portion on which the operator sits (the buttocks and thighs are placed). The backrest portion 13B is a portion on which the seated operator leans back, and is provided so as to extend upward to the rear portion of the seat portion 13A.
As shown in FIGS. 5B and 7B, a cockpit 319 is provided on the right side (other side) of the driver's seat 13. A control lever 16 is provided on the front side of the cockpit 319 toward the inside of the aircraft. An armrest 320 is provided on the cockpit 319. The armrest 320 is arranged behind the control lever 16. Further, the armrest 320 is arranged on the right side of the driver's seat 13.

The cockpit 319 has a console box 319A. The console box 319A is attached to the cabin frame 304. Various switches are centrally arranged on the side and rear of the armrest 320 on the upper surface of the console box 319A. As shown in FIG. 4, the cockpit 319 has a support bracket 321. As shown in FIGS. 4 and 7A, the support bracket 321 is fixed to the inclined wall 72a of the floor frame 72 described later. The support bracket 321 is provided inside the front portion of the console box 319A. The front portion of the console box 319A is attached to the support bracket 321 and supported.

The control lever 16 is supported by the support bracket 321. Specifically, the remote control valve 322 is attached to the support bracket 321 (see FIG. 7A), and the control lever 16 is attached to the remote control valve 322 via an interlocking member or the like (see FIG. 5B). That is, the control lever 16 is supported by the support bracket 321 via the remote control valve 322. The remote control valve 322 is a pilot-operated valve that pilot-operates a control valve that controls the lift cylinders 11L and 11R and a control valve that controls the work tool cylinder 12. As shown in FIG. 7A, the remote control valve 322 is arranged on the lower side of the support bracket 321 and is fixed to the mounting plate 333 attached to the support bracket 321. The remote control valve 322 is covered by the console box 319A together with the support bracket 321. The control lever 16 projects from the console box 319A and its base is covered by a boot member 334 (see FIG. 5A).

As shown in FIGS. 4, 5A, and 5B, the working machine 1 (cabin 14) has a blocking member 325 that blocks the operator from getting on and off from the opening 313 on the right side of the driver's seat. That is, in the present embodiment, the opening 313 is not used as an entrance / exit (passage for getting on / off) for the operator to get on and off. Therefore, in the present embodiment, the boarding / alighting step, the handrail, and the like are not provided on the right side surface of the cabin 14. The blocking member 325 is formed of a rod-shaped member such as a pipe material, and is provided over the cockpit 319 and the second front support column 142R. As a result, the operator can be made to recognize that the opening 313 is not a passage for getting on and off, and the blocking member 325 interferes with getting on and off, so that the operator is on the right side of the cabin 14 (the side opposite to the passage for getting on and off). It is possible to suppress getting on and off from.

As shown in FIG. 5B, the blocking member 325 is arranged so as to extend in the front-rear direction K1 (horizontal direction) of the machine body, and is arranged below the upper end of the control lever 16 and above the bottom surface of the seat portion 13A. ing. As a result, the blocking member 325 can be arranged at a position that does not obstruct the view of the operator seated in the driver's seat 13 while suppressing the operator from getting on and off from the side opposite to the entrance / exit 309.

As shown in FIG. 7B, the blocking member 325 is arranged at a position where it overlaps with the control lever 16 along the line-of-sight direction of the operator seated in the driver's seat 13. That is, when the operator looks at the blocking member 325 from the driver's seat 13, a part or all of the blocking member 325 is hidden by the control lever 16. This makes it possible to prevent the blocking member 325 from obstructing the operator's field of view.

As shown in FIG. 6, the blocking member 325 has a front portion attached to the second front support column 142R and a rear portion attached to the support bracket 321. Specifically, the mounting piece 326 is fixed to the second front support column 142R, and the mounting stay (referred to as the first mounting stay) 327 is fixed to the front portion of the blocking member 325. Bolts 328 are penetrated through the mounting pieces 326 and the first mounting stay 327 from the outer side of the machine body, and the bolts 328 are screwed into nuts fixed to the surface of the first mounting stay 327 on the inner side of the machine body. As a result, the front portion of the blocking member 325 is attached to the second front support column 142R. Further, a mounting stay (referred to as a second mounting stay) 329 is fixed to the rear portion of the blocking member 325. It has a first part 329a whose plate surface faces K1 in the front-rear direction of the machine body, and a second part 329b extending rearward from the end portion of the first part 329a on the side of the machine body. A blocking member 325 is fixed to the upper part of the first portion 329a. A bolt 330 is penetrated from the outer side of the machine body into the side wall 321a on the outer side of the machine body of the second part 329b and the support bracket 321. It has been. As a result, the rear portion of the blocking member 325 is attached to the support bracket 321.

By removing the bolt 328 and the bolt 330, the blocking member 325 can also be removed. However, since the rear portion of the blocking member 325 and the second mounting stay 329 are housed in the console box 319A together with the support bracket 321, they are configured so that they cannot be easily removed.
As shown in FIG. 6, the second portion 329b has a bolt insertion hole 331 through which the bolt 330 is inserted. The bolt insertion hole 331 is formed in a long elongated hole in the front-rear direction K1 of the machine body. As a result, the mounting error (manufacturing error) can be absorbed when the blocking member 325 is mounted.

In this embodiment, the case where the blocking member 325 is applied to the working machine 1 equipped with the cabin 14 is illustrated, but the present invention is not limited to this. For example, the blocking member 325 can also be applied to a working machine 1 equipped with a canopy having an open portion for communicating the space on the floor portion 75 in front of the driver's seat 13 with the outside of the machine body 2 behind the front support column.
As shown in FIG. 4, the working machine 1 has a floor frame 72 mounted on the machine frame 71 (body 2). The floor frame 72 is fixed to the lower part of the cabin frame 304. That is, the floor frame 72 constitutes the lower part of the cabin 14. Therefore, the floor frame 72 is vibration-proof supported by the airframe frame 71 together with the cabin 14 via the mount member 303.

As shown in FIGS. 8A and 8B, the floor frame 72 has a left first side wall 73L and a right second side wall 73R. A bottom wall (installation portion) 74 is provided between the lower part of the first side wall 73L and the second side wall 73R. The floor frame 72 has a floor portion (step) 75 provided on the front side of the bottom wall 74. The bottom wall 74 is located below the floor portion 75. Therefore, there is a gap between the front end side of the bottom wall 74 and the rear end side of the floor portion 75. A rubber mat 332 is laid on the floor 75 (see FIG. 5A).

As shown in FIG. 8A, the floor portion 75 has a floor portion main body 77 having an inspection opening 77a and an opening / closing cover 78 for closing the inspection opening 77a. The opening / closing cover 78 is detachably attached to the floor body 77 by bolts or the like. The floor body 77 has a first part 79, a second part 80, and a third part 81.
As shown in FIGS. 8A and 8B, the first portion 79 constitutes the left portion of the floor portion main body 77. The rear portion 79a of the first portion 79 is formed to have a width narrower in the body width direction K2 than the front portion 79b. Specifically, the rear 79a is located on the outer side (left side) of the machine body from the first side wall 73L, and the front 79b is a part extending forward from the rear 79a and a machine from the part to the rear 79a. It has a part that extends to the inside (right side).

The second portion 80 constitutes the right portion of the floor portion main body 77. The rear portion 80a of the second portion 80 is formed to have a width narrower in the body width direction K2 than the front portion 80b. Specifically, the rear portion 80a is located on the outer side (right side) of the fuselage from the second side wall 73R, and the front portion 80b is a portion extending forward from the rear portion 80a and a portion extending from the portion to the rear portion 80a. It has a part that extends to the inside (left side).

The floor frame 72 has an inclined wall 72a extending in an inclined direction that shifts upward from the rear end of the rear portion 80a toward the rear. The support bracket 321 is fixed to the inclined wall 72a (see FIG. 7A).
The third portion 81 is located at the center of the aircraft width direction K2, and is located between the front portion 79b of the first portion 79 and the front portion 80b of the second portion 80. The third portion 81 connects the front portion 79b and the front portion 80b. Specifically, the third portion 81 connects the rear side of the front portion 79b and the front portion 80b to each other. The third portion 81 is formed in a recess that is recessed downward.

There is an opening between the rear portion 79a of the first portion 79 and the rear portion 80a of the second portion 80, and this opening is the inspection opening 77a. When the rubber mat 332 and the opening / closing cover 78 are removed, the equipment and the like deployed in the machine frame 71 can be inspected through the inspection opening 77a.
As shown in FIG. 5A, a steering column 87 that supports the steering 15 is provided in the front portion of the cabin interior. The steering column 87 is located in the center of the cabin in the airframe width direction K2.

As shown in FIG. 8A, the steering column 87 has a column frame (frame member) 88 erected in front of the floor frame 72. Further, as shown in FIG. 5A, the steering column 87 has a column cover 89 that covers the column frame 88.
As shown in FIG. 8A, the column frame 88 is provided at the center of the front portion of the floor frame 72 in the width direction of the machine body K2. The column frame 88 is located in front of the third portion 81. The column frame 88 has a first side wall 88L and a second side wall 88R arranged at intervals in the body width direction K2. The first side wall 88L constitutes the left portion of the column frame 88 and is erected on the floor portion 75. The second side wall 88R constitutes the right portion of the column frame 88 and is erected on the floor portion 75.

As shown in FIG. 9, the column frame 88 has a first connecting member 83 and a second connecting member 84. The first connecting member 83 connects the upper portions of the rear portion of the first side wall 88L and the second side wall 88R. The second connecting member 84 connects the lower portions of the first side wall 88L and the second side wall 88R to each other. A steering valve 90 that controls the steering cylinder 6 is attached to the lower surface side of the second connecting member 84.

As shown in FIG. 5A, the front side of the steering column 87 is open. As shown in FIG. 3, the front panel 141 and the cover panel 147 cover the front side of the steering column 87.
As shown in FIGS. 9A and 9B, a brake pedal (referred to as a first brake pedal) 111L is arranged on the left side of the column frame 88. On the right side of the column frame 88, another brake pedal (referred to as a second brake pedal) 111R different from the first brake pedal 111L is arranged. A brake shaft 112 having an axial center extending in the width direction of the machine body K2 is provided on the upper portion of the column frame 88. The brake shaft 112 is formed of a single bar, penetrates the upper and front portions of the first side wall 88L and the second side wall 88R, and is rotatably supported by these side walls 88L and 88R about the axis.

The left portion of the brake shaft 112 projects to the left from the bearing boss 113 fixed to the outside of the first side wall 88L. The upper part 114L of the first brake pedal 111L is fixed to this protruding portion. Therefore, the first brake pedal 111L rotates integrally with the brake shaft 112. Below the first brake pedal 111L, a step portion 115L that is operated by the operator is provided. That is, the first brake pedal 111L is a suspension type brake pedal.

As shown in FIG. 10, the right portion of the brake shaft 112 projects outward from the second side wall 88R. A pedal boss 114R provided above the second brake pedal 111R is attached to the right side of the brake shaft 112. Therefore, the second brake pedal 111R also rotates integrally with the brake shaft 112. A step portion 115R that the operator steps on is also provided below the second brake pedal 111R. That is, the second brake pedal 111R is also a hanging type brake pedal.

As shown in FIG. 10, the brake shaft 112 has a coupling portion 116 formed by a spline on the right portion. The coupling portion 116 is formed up to the right end of the brake shaft 112. A bearing cylinder 117 that supports the brake shaft 112 is fixed to the inner upper portion of the second side wall 88R. The bearing cylinder 117 penetrates the second side wall 88R and protrudes from the second side wall 88R toward the inside of the machine. Both ends of the bearing cylinder 117 in the axial direction are open, and the joint portion 116 is inserted through the bearing cylinder 117. The coupling portion 116 projects from the left end portion of the bearing cylinder 117. A brake arm 118 is arranged on the left side of the bearing cylinder 117. The brake arm 118 has an arm boss 119 fitted to the joint portion 116 and an arm portion 120 fixed to the arm boss 119. The arm boss 119 is spline-coupled to the coupling portion 116 and rotates integrally with the brake shaft 112. Further, the arm boss 119 has a bearing portion 119a inserted into the bearing cylinder 117. The brake shaft 112 is supported by the bearing cylinder 117 via the bearing portion 119a and the bush 121.

As shown in FIG. 10, the coupling portion 116 has a protruding portion 116a protruding from the right end portion of the bearing cylinder 117 to the outside of the machine body (the side opposite to the arrangement side of the first brake pedal 111L). .. The pedal boss 114R is fitted into the protruding portion 116a from the right side and splined to rotate integrally with the brake shaft 112. The pedal boss 114R has a shaft support 132 that is inserted into the bearing cylinder 117. A bush 133 provided on the inner peripheral side of the bearing cylinder 117 is fitted on the outer circumference of the shaft support portion 132. The brake shaft 112 is supported by the bearing cylinder 117 via the shaft support 132 and the bush 133.

As shown in FIG. 11, one end of the connecting link 122 is pivotally supported at the rear portion of the arm portion 120, and the other end of the connecting link 122 is connected to the upper portion of the piston rod 124 of the master cylinder 123. Therefore, by depressing the first brake pedal 111L or the second brake pedal 111R, the rear portion of the brake arm 118 swings downward as the brake shaft 112 rotates, and the piston rod 124 is pushed in via the connecting link 122. .. As a result, the master cylinder 123 operates and the brake device (not shown) operates.

As shown in FIG. 11, the arm portion 120 is provided with a first contact portion 120a and a second contact portion 120b. A regulation rod 129 is provided between the first contact portion 120a and the second contact portion 120b. As shown in FIGS. 9A and 9B, the regulation rod 129 is fixed to the second side wall 88R so as to project toward the inside of the machine. When the first contact portion 120a comes into contact with the regulation rod 129, the swing of the first brake pedal 111L and the second brake pedal 111R in the direction opposite to the stepping direction (counter-stepping direction) is restricted. The positions of the brake pedals 111L and 111R in the state where the first contact portion 120a is in contact with the regulation rod 129 are the positions before stepping on. Further, when the second contact portion 120b comes into contact with the regulation rod 129, the swing of the first brake pedal 111L and the second brake pedal 111R in the stepping direction is restricted.

As shown in FIGS. 9A and 9B, on the right side between the first side wall 88L and the second side wall 88R, the return spring 131 that returns the brake pedals 111L and 111R to the positions before the operation (the set position at the time of non-operation). Is placed. The return spring 131 is composed of a torsion coil spring and is provided so as to surround the brake shaft 112. In the present embodiment, the return spring 131 is provided so as to surround the outer circumference of the bearing cylinder 117. One end (left end) 131a of the return spring 131 is locked to the brake arm 118 (see FIG. 11). The other end (right end) 131b of the return spring 131 is hooked on the regulation rod 129. As a result, the return spring 131 urges the first brake pedal 111L and the second brake pedal 111R in the counter-depressing direction.

As shown in FIG. 11, a connecting rod 335 is fixed to the tip end side of the arm portion 120 so as to project outward from the machine body. One end of the cable 336 is pivotally connected to one end side (the end portion on the outer side of the machine body) of the connecting rod 335. Specifically, the cable 336 has an inner cable 336A and an outer cable 336B, and one end of the inner cable 336A is connected to the connecting rod 335. The first cable stay 337 is fixed to the surface of the second side wall 88R on the side of the machine body. The first cable stay 337 is provided at the rear and the lower part of the second side wall 88R. One end side of the cable 336 is attached to the first cable stay 337. Specifically, the outer cable 336B is attached to the first cable stay 337. As shown in FIG. 12, the cable 336 is arranged below the floor frame 72 through the cable insertion hole 348 formed in the floor frame 72. As shown in FIG. 8B, the cable insertion hole 348 is formed in the front portion 80b of the second portion 80 of the floor portion main body 77.

The cable 336 is a cable that interlocks and connects the brake arm 118 (brake pedals 111L, 111R) and the inching valve (valve) 338 (see FIGS. 11 and 12).
As shown in FIG. 13, the inching valve 338 is arranged on the front end side and below the bottom wall 74 of the floor frame 72. The inching valve 338 is attached to the bottom wall 74 below the driver's seat 13. FIG. 12 is a bottom view of the floor frame 72 as viewed from below. As shown in FIG. 12, the inching valve 338 is arranged on the right side of the bottom wall 74.

As shown in FIG. 14, the inching valve 338 is attached to the valve bracket 339, and the valve bracket 339 is attached to the mounting bracket 340 fixed to the bottom wall 74. The valve bracket 339 has a valve mounting portion 339a to which the inching valve 338 is mounted, and a bracket mounting portion 339b extending upward from the valve mounting portion 339a. The mounting bracket 34 is fixed to the upper surface of the bottom wall 74 so that the front end portion slightly protrudes from the front end of the bottom wall 74. The mounting bracket 340 includes a mounting wall 340a erected on the bottom wall 74 so that the mounting surface (front surface) faces forward, and a first side wall 340b extending rearward from one end side of the mounting wall 340a in the body width direction K2. It has a second side wall 340c extending rearward from the other end side of the mounting wall 340a in the body width direction K2. The upper part of the bracket mounting portion 339b is overlapped on the front surface of the mounting wall 340a and mounted by the bolt 341.

As shown in FIG. 14, a second cable stay 342 to which the other end side of the cable 336 is attached is attached to the bracket attachment portion 339b. The second cable stay 342 has a first wall portion 342a, a second wall portion 342b, and a third wall portion 342c. The first wall portion 342a is overlapped with the front surface of the bracket mounting portion 339b and fixed by the bolt 343. The second wall portion 342b extends forward from the end portion of the first wall portion 342a on the outer side of the machine body. The third wall portion 342c extends from the second wall portion 342b toward the inside of the aircraft. Specifically, the third wall portion 342c extends in an inclined direction that shifts forward toward the inside of the aircraft. The outer cable 336B is attached to the third wall portion 342c.

As shown in FIG. 14, the inching valve 338 has a valve body 338A having a rectangular block shape and a valve lever 338B for operating the valve body 338A. The valve body 338A is horizontally attached to the valve bracket 339. The valve body 338A has a first connecting portion 346 on the back surface 338a, a second connecting portion 347 on one side surface (left side surface) 338b, and an operating shaft 345 on the upper surface 338c side.

As shown in FIG. 12, the first connection portion 346 is connected to the discharge circuit 351 of the hydraulic pump 349 via the hydraulic hose (first hydraulic hose) 350. The hydraulic pump 349 is, for example, a constant-capacity pump, which is connected to the side of the prime mover 352 and driven by the power of the prime mover 352. Further, the hydraulic pump 349 discharges the hydraulic oil stored in the hydraulic oil tank (tank) 344. Specifically, the hydraulic pump 349 discharges hydraulic oil (pilot oil) that hydraulically controls the hydraulic drive device 353. The hydraulic oil tank 344 is arranged on the left side of the inching valve 338 (the side on the side where the second connecting portion 347 is provided). The second connection portion 347 is connected to the hydraulic oil tank 344 via a hydraulic hose (second hydraulic hose) 354.

The hydraulic drive device 353 is composed of, for example, an HST (Hydro Static Transmission), and drives the traveling device 17 hydraulically. Specifically, the HST 353 of the present embodiment is closed circuit-connected by an HST pump 355 composed of a swash plate type variable displacement pump driven by the power of a motor 352 and a pair of oil passages 356a and 356b with the HST pump 355. It has an HST motor 357 that drives the traveling device 17 by being driven by the discharged oil from the HST pump 355.

The HST pump 355 can change the direction of the hydraulic oil to be discharged by swinging the swash plate 355A that swings from the neutral position to one side and the other side. The rotation direction of the HST motor 357 is switched by discharging hydraulic oil from the HST pump 355 to the oil passage 356a or the oil passage 356b, and outputs forward power or reverse power to the traveling device 17.
The HST 353 has a servo cylinder 358 that sets the angle of the swash plate 355A of the HST pump 355. The servo cylinder 358 is connected to the forward / reverse switching valve 359 by the forward oil passage 360 and the reverse oil passage 361. The forward / backward switching valve 359 is connected to the discharge circuit 351 of the hydraulic pump 349 via the supply oil passage 362, and is connected to the hydraulic oil tank 344 via the tank oil passage 363.

When the pilot oil is supplied from the forward / backward switching valve 359 to the forward oil passage 360, the servo cylinder 358 swings the swash plate 355A to the forward side, and the forward / backward switching valve 359 to the reverse oil passage 3
When pilot oil is supplied to 61, the swash plate 355A is swung to the reverse side, and when pilot oil is not supplied to the forward oil passage 360 and the reverse oil passage 361, the swash plate 355A is held in the neutral position. To do.

The valve body 338A (inching valve 338) is formed by a rotary valve, and the operation shaft 345 is integrally formed (or separately formed and connected) to the rotary pool of the valve body 338A. The operation shaft 345 is rotatable around the vertical axis, and by rotating around the vertical axis, the inching valve 338 is switched between an off state (closed state) and an on state (open state). When the inching valve 338 is switched to the off state, the connecting oil passage connecting the first connecting portion 346 and the second connecting portion 347 is cut off. As a result, the pilot oil discharged from the hydraulic pump 349 can be supplied to the forward / backward switching valve 359, and the swash plate 355A swings forward or backward according to the switching of the forward / backward switching valve 359. When the inching valve 338 is switched to the on state (open state), the connecting oil passage connecting the first connecting portion 346 and the second connecting portion 347 is opened. As a result, the pilot oil discharged from the hydraulic pump 349 is discharged to the hydraulic oil tank 344 and is not supplied to the forward / reverse switching valve 359. At this time, when the swash plate 355A swings to the forward side or the reverse side, the swash plate 355A moves to the neutral side, and the traveling device 17 decelerates or stops. Since the valve opening degree of the inching valve 338 changes depending on the rotation angle of the operating shaft 345 (because the amount of pilot oil discharged to the hydraulic oil tank 344 changes), the deceleration of the traveling device 17 is decelerated by the inching valve 338. Can be adjusted by.

As shown in FIG. 14, one end side of the valve lever 338B is sandwiched and fixed to the operation shaft 345. Therefore, the valve lever 338B can rotate around the vertical axis (axis center of the operating shaft 345) together with the operating shaft 345. The other end side of the cable 336 is connected to the other end side of the valve lever 338B. Specifically, the other end side of the inner cable 336A is connected to the other end side of the valve lever 338B. Therefore, the inching valve 338 is interlocked with the brake pedals (pedals) 111L and 111R via the cable 336.

As shown in FIG. 14, the valve lever 338B is in a state of protruding forward from the operation shaft 345 when the brake pedals 111L and 111R are not depressed, and the inching valve 338 is in the off state in this state. When the brake pedals 111L and 111R are depressed, the brake arm 118 (arm portion 120) swings downward and the cable 336 (inner cable 336A) is pushed. Then, the valve lever 338B is pushed by the cable 336 and rotates around the vertical axis together with the operation shaft 345. That is, when the brake pedals 111L and 111R are stepped on, the valve lever 338B swings to the left around the vertical axis (axis center of the operating shaft 345) to rotate the operating shaft 345. As a result, the inching valve 338 is turned on, the swash plate 355A returns to the neutral position, and power is not output from the HST 353 to the traveling device 17. Therefore, by depressing the brake pedals 111L and 111R, the brake device is activated to brake the traveling device 17, and the HST353 is in the neutral state.

In the above configuration, the brake pedals 111L and 111R and the inching valve 338 are attached to the floor frame 72 supported by the machine body 2 via the mount member 303. That is, the brake pedals 111L and 111R and the inching valve 338 are attached to the same vibration system. Therefore, since the brake pedals 111L and 111R, the cable 336 and the inching valve 338 move together with the floor frame 72 by the vibration of the machine body 2, it is possible to suppress the inching valve 338 from being affected by the running vibration and the working vibration.

Further, by interlocking the brake pedals 111L and 111R and the inching valve 338 with the cable 336, the degree of freedom in the mounting position of the inching valve 338 can be increased.
Further, the vibration of the machine body 2 is mostly vertical vibration (vertical vibration), but the valve lever 338B is rotatably attached to the valve body 338A around the vertical axis and rotates around the vertical axis. Since the structure is such that the inching valve 338 is operated, it is possible to prevent the valve lever 338B from being moved by the vertical vibration of the machine body 2 and to prevent the valve lever 338B from being moved by the vertical vibration to reduce the traveling speed. ..

As shown in FIG. 13, a seat base 76 is attached to the bottom wall 74, and a driver's seat 13 is attached to the seat base 76. Specifically, the driver's seat 13 is attached to the suspension device 364 attached to the seat base 76. The seat base 76 has an upper wall 76a and a front wall 76b extending downward from the front end of the upper wall 76a. The mounting wall 76c extends from the lower end of the front wall 76b, and the mounting wall 76c is bolted to the front portion of the bottom wall 74. The seat base 76 has support legs 76d to which the opening / closing cover 78 is attached. Specifically, the support legs 76d extend upward from the front end of the mounting wall 76c and the upper portion is bent forward. The rear portion of the opening / closing cover 78 is detachably attached to the upper portion of the support leg 76d by a bolt or the like. A mounting bracket 340, an inching valve 338, a valve bracket 339, and a second cable stay 342 are arranged below the rear portion of the opening / closing cover 78. Therefore, the inching valve 338 can be accessed by removing the rubber mat 332 and the opening / closing cover 78 laid on the floor portion 75. As a result, the inching valve 338 and the like can be inspected and assembled.

When assembling the inching valve 338 to the cabin 14, first, before assembling the cabin 14 to the machine frame 71, the inching valve 338 and the second cable stay 342 are attached to the valve bracket 339 and sub-assembled. The first hydraulic hose 350 is connected to the hydraulic pump 349 side, and the second hydraulic hose 354 is connected to the hydraulic oil tank 344. The cabin 14 is assembled via the mount member 303 by hanging the brake pedals 111L, 111R, the brake arm 118, the cable 336, etc. from above with respect to the airframe frame 71 with the opening / closing cover 78 removed. After assembling the cabin 14 to the fuselage frame 71, the cable 336 is attached to the second cable stay 342 and the first hydraulic hose 350 and the second hydraulic hose 354 are attached to the inching valve 338 via the inspection opening 77a. In this state, the valve bracket 339 is attached to the mounting bracket 340. As described above, the inching valve 338 and the like can be easily assembled.

As shown in FIG. 15, an air conditioner main body 70 for air conditioning in the cabin room is arranged at the rear of the floor frame 72. Further, the air conditioner main body 70 is arranged at a position deviated to the left from the central portion of the floor frame 72 in the body width direction K2. Above the air conditioner main body 70, an introduction duct 365 for introducing the inside air (air inside the cabin) and the outside air (air outside the cabin room) into the air conditioner main body 70 is provided. On the right side of the air conditioner main body 70, a first guide duct 366 that guides the conditioned air blown out from the air conditioner main body 70 to the front part of the cabin 14 is arranged. On the right side of the first guide duct 366, a second guide duct 367 that guides the conditioned air flowing through the first guide duct 366 to the rear part of the cabin 14 is arranged.

As shown in FIG. 13, the air conditioner main body 70 is arranged below the driver's seat 13 (inside the seat base 76) and is attached to the bottom wall 74. The air conditioner main body 70 has a case 70A, a blower 70B housed in the case 70A, an evaporator, and the like, and constitutes the main body of the air conditioner equipped in the work machine 1. Further, the air conditioner main body 70 is arranged in front of the back lower wall 371 that constitutes the lower part of the back of the floor frame 72. As shown in FIG. 8B, the back lower wall 371 is provided over the first side wall 73L and the second side wall 73R. Further, the back lower wall 371 has a first wall portion 371a that rises upward from the rear end portion of the bottom wall 74, and an inclined second wall portion 371b that moves upward from the upper end of the first wall portion 371a toward the rear. And have. The left wall portion 371c of the second wall portion 371b extends upward from the central portion and the right portion of the second wall portion 371b.

As shown in FIG. 13, the introduction duct 365 has a duct main body 365a that communicates with the inside of the air conditioner main body 70, and an extension duct 365b that extends upward from the duct main body 365a in an inclined direction. .. The upper end of the extension duct 365b is open. The upper part of the extension duct 365b is an introduction port 365c for introducing air.
As shown in FIG. 15, at the rear portion of the floor frame 72, an inside / outside air introduction portion 368 for introducing the inside air and the outside air into the air conditioner main body 70 is provided. The inside / outside air introduction portion 368 is provided on the upper part of the floor frame 72. Specifically, it is provided above the back lower wall 371. Further, the inside / outside air introduction unit 368 is arranged behind the driver's seat 13 (see FIG. 19). Further, the inside / outside air introduction unit 368 includes an inside / outside air switching unit 370 that switches between the inside air introduction state and the outside air introduction state, and a filter 372 that collects dust contained in the inside air or the outside air introduced by the inside / outside air switching unit 370 (FIG. 18). It has a filter accommodating portion 369 for accommodating (see). The inside / outside air switching unit 370 and the filter accommodating unit 369 are adjacent to each other in the width direction of the machine body K2. Specifically, the inside / outside air switching unit 370 is provided at a substantially central portion in the width direction of the machine body K2, and the filter accommodating unit 369 is on the side of the inside / outside air switching unit 370 and on the side corresponding to the air conditioner body 70. It is provided in. Roughly explaining the flow of air taken into the air conditioner main body 70, the inside air or the outside air is sucked by the blower 70B in the air conditioner main body 70 and taken into the inside / outside air switching unit 370, and is taken into the inside / outside air switching part 370. Air enters the introduction duct 365 through the introduction port 365c through the filter accommodating portion 369 and is taken into the air conditioner main body 70.

As shown in FIGS. 8B and 16, the inside / outside air introduction unit 368 has an inside / outside air introduction box 373 that forms a part of the inside / outside air switching unit 370 and the filter accommodating unit 369. The inside / outside air introduction box 373 includes a front wall 374, a rear wall 375, an upper wall 376, a bottom wall 377, a first side wall 73L, and a second side wall 73R.
The front wall 374 is located above the back lower wall 371, and the central side in the body width direction K2 is connected to the upper end of the back lower wall 371 via the connecting wall 384. The rear wall 375 is spaced behind the front wall 374. The upper wall 376 is provided from the upper end of the front wall 374 to the rear wall 375. The bottom wall 377 is formed over the front wall 374 and the rear wall 375. The first side wall 73L constitutes the left side surface of the inside / outside air introduction box 373. The second side wall 73R constitutes the right side surface of the inside / outside air introduction box 373. The inside / outside air introduction box 373 is not provided with a member for partitioning the inside in the body width direction K2. That is, the inside of the inside / outside air introduction box 373 communicates with each other in the body width direction K2. Therefore, the inside of the inside / outside air switching unit 370 and the inside of the filter accommodating unit 369 communicate with each other.

The front wall 374 is formed in an inclined shape that shifts backward as it goes upward. The front wall 374 has an opening 378 formed by a rectangular opening edge at the center of the airframe width direction K2. The opening 378 is closed by a closing plate 380 attached to the front wall 374 from the front of the fuselage. The closing plate 380 is formed with an inside air introduction port 381 for taking in inside air. As shown in FIG. 15, the inside air introduction port 381 has a lower introduction port 382A formed in the lower part of the closing plate 380 and an upper introduction port 382B formed in the upper part of the closing plate 380. As shown in FIG. 17, the lower introduction port 382A and the upper introduction port 382B are composed of an aggregate of a large number of small holes.

As shown in FIG. 16, the front wall 374 has a notch 379 on the left side. The notch portion 379 is formed of an upper edge portion 379a and a side edge portion 379b extending downward from the right end of the upper edge portion 379a, and is formed in an open shape to the left and downward. The notch portion 379 is formed at a position corresponding to the wall portion 371c.
As shown in FIG. 16, the bottom wall 377 is formed in a stepped shape in the body width direction K2. The bottom wall 377 includes a first portion 377a at the center of K2 in the width direction of the machine body, a second portion 377b located to the left of the first portion 377a, and a third portion 377c located to the right of the first portion 377a. Have. The first site 377a is formed at a position higher than that of the second site 377b. The third site 377c is formed at a position higher than that of the first site 377a. The first portion 377a extends rearward from the lower end edge of the opening 378 toward the rear wall 375. The first portion 377a constitutes the bottom portion of the inside / outside air switching portion 370. An outside air introduction port 387 for taking in outside air is formed in the first portion 377a. The outside air introduction port 387 is formed by arranging a plurality of elongated holes 388 long in the front-rear direction K1 of the machine body in the width direction K2 of the machine body.

As shown in FIGS. 16 and 18, the second portion 377b extends from a position lower than the upper end of the wall portion 371c toward the rear wall 375. The second portion 370b constitutes the bottom of the filter accommodating portion 369. An inspection opening 385 is formed in a portion of the left portion of the rear wall 375 that constitutes the filter accommodating portion 369. The inspection opening 385 is closed by a closing member 386 attached to the rear wall 375 from the front of the fuselage.

As shown in FIG. 16, the bottom wall 377 is a first vertical wall 377d connecting the first part 377a and the second part 377b, and a second vertical wall 377e connecting the first part 377a and the third part 377c. And have.
As shown in FIG. 19, a partition member 389 forming the front surface of the prime mover room E1 is provided behind the floor frame 72. The partition member 389 is formed of a plurality of plate members. In addition, it may be formed by a single plate material. A fuel tank 390 is arranged between the partition member 389 and the floor frame 72. The fuel tank 390 is provided below the first portion 377a and the third portion 377c. Since the first portion 377a and the third portion 377c are formed at positions higher than the second portion 377b, the height of the fuel tank 390 can be increased, and the capacity of the fuel tank 390 can be increased. .. The outside air introduction port 387 is provided above the fuel tank 390. Therefore, the outside air is taken into the inside / outside air introduction unit 368 (inside / outside air switching unit 370) from the accommodating portion of the fuel tank 390 in front of the partition member 389 inside the airframe frame 71. A bottom opening 71B is formed in the bottom 71A of the machine frame 71. Further, the outside air is taken into the inside of the airframe frame 71 from the bottom opening 71B. The outside air is taken in from a portion inside the airframe frame 71 and isolated from the prime mover room E1. As a result, outside air can be taken in from a portion that is not affected by the exhaust gas discharged from the prime mover 352 and the heat of the prime mover 352.

As shown in FIG. 17, the inside / outside air switching unit 370 has an inside / outside air switching mechanism 400 that switches between a state in which only the inside air is taken in without taking in the outside air and a state in which the outside air and the inside air are taken in. The configuration of the inside / outside air switching unit 370 is not limited to this, and may be, for example, a configuration for switching between a state in which only the inside air is taken in and a state in which only the outside air is taken in.
The inside / outside air switching unit 370 includes an inside / outside air introduction box 373, a closing plate 380, and an inside / outside air switching mechanism 400.

The inside / outside air switching mechanism 400 has a switching damper 391 that can be repositioned to an outside air introduction position P1 (see a solid line) that takes in outside air and an inside air introduction position P2 (see a two-dot chain line) that takes in inside air without taking in outside air. The switching damper 391 is arranged on the rear side of the closing plate 380 (inside the inside / outside air switching portion 370). The switching damper 391 is arranged below the upper introduction port 382B at the outside air introduction position P1. Therefore, the switching damper 391 closes the lower introduction port 382A at the outside air introduction position P1. That is, when the switching damper 391 is switched to the outside air introduction position P1, the inside air from the upper introduction port 382B and the outside air from the outside air introduction port 387 are taken into the inside / outside air switching unit 370 (inside / outside air introduction box 373). Further, the switching damper 391 closes the outside air introduction port 387 at the inside air introduction position P2. Therefore, when the switching damper 391 is switched to the inside air introduction position P2, the outside air is not taken in, and the inside air is taken into the inside / outside air introduction box 373 from the lower introduction port 382A and the upper introduction port 382B.

As shown in FIG. 17, the switching damper 391 includes a plate member 392, a first cushion member 393, a second cushion member 394, and an abutting member 398. The first cushion member 393 is fixed to one side surface of the plate member 392, and closes the lower introduction port 382A at the outside air introduction position P1. The second cushion member 394 is fixed to the other side surface of the plate member 392, and closes the outside air introduction port 387 at the inside air introduction position P2. The abutting member 398 is fixed to the plate member 392, abuts on the closing plate 380 at the outside air introduction position P1, and abuts on the first portion 377a at the inside air introduction position P2.

The inside / outside air switching mechanism 400 has a switching lever 395 that operates the switching damper 391, and a support boss (cylindrical member) 399 that pivotally supports the switching lever 395. The switching lever 395 has a lever base portion 395a and a grip portion 395b. The support boss 399 is arranged below the inside air introduction port 381 and in front of the outside air introduction port 387. The support boss 399 has an axial center extending in the body width direction K2 and is fixed to the lower part of the closing plate 380. The lever base 395a is rotatably supported by the support boss 399 around the axis in the body width direction K2. A plate member 392 is fixed to the lever base 395a. Therefore, the switching damper 391 rotates around the axis of the lever base portion 395a by swinging the switching lever 395 up and down, and changes its position to the outside air introduction position P1 and the inside air introduction position P2. Further, the switching lever 395 projects forward from the closing plate 380 (driver's seat 13 side), and the operator can operate the switching lever 395 from the driver's seat 13 side.

As shown in FIG. 17, the inside / outside air switching mechanism 400 has an urging member 396 that holds the switching damper 391 at the outside air introduction position P1 and the inside air introduction position P2. The urging member 396 is formed by a torsion coil spring, and one end side thereof is locked to a pin 398a provided on the contact member 398. The inside / outside air switching mechanism 400 has a bracket 397 that locks the other end side of the urging member 396. The bracket 397 is fixed to the back surface of the closing plate 380 and projects rearward from the closing plate 380. A pin 397a is fixed to the rear portion of the bracket 397, and the other end side of the urging member 396 is locked to the pin 397a. The urging force of the urging member 396 acts in the direction of pressing the switching damper 391 against the closing plate 380 at the outside air introduction position P1, and acts in the direction of pressing the switching damper 391 against the first portion 377a at the inside air introduction position P2. The plate member 392 is formed with a notch opening so as not to interfere with the contact member 398, the urging member 396, and the bracket 397. Further, the first cushion member 393 and the second cushion member 394 are separated into left and right sides of the contact member 398, the urging member 396, and the bracket 397 (see FIG. 20).

As shown in FIGS. 18 and 20, the filter accommodating portion 369 has a filter bracket 401 to which the filter 372 is attached. The filter accommodating portion 369 includes an inside / outside air introduction box 373, a filter 372, and a filter bracket 401.
As shown in FIG. 15, the filter bracket 401 is bolted to the front wall 374 and the first side wall 73L so as to cover the notch 379.

As shown in FIGS. 18 and 20, the filter 372 is attached to the rear portion of the filter bracket 401. The filter 372 is a flat plate-shaped filter that collects dust by circulating air in the thickness direction. The filter 372 is arranged vertically so that the filter surface 372a faces the front and back. Specifically, the filter 372 is mounted in an inclined manner that shifts backward as it goes upward. The inside / outside air switching unit 370 communicates with the back side of the filter 372 in the filter accommodating unit 369. Specifically, a first flow passage 402 through which air can flow is formed between the filter 372 and the rear wall 375, and this first flow passage 403 communicates with the inside of the inside / outside air switching portion 370.

As shown in FIG. 18, the introduction duct 365 communicates with the front side of the filter 372 in the filter accommodating portion 369. Specifically, a second flow passage 403 through which air can flow is formed between the filter 372 and the front portion 401a of the filter bracket 401, and an introduction duct 365 (introduction port 365c) is formed on the front side and the lower side of the filter 372. It is connected to the filter accommodating portion 369, and the second flow passage 403 communicates with the introduction duct 365.

The inside air and the outside air taken into the inside / outside air switching unit 370 reach the first flow passage 402, pass through the filter 372 from the first flow passage 402, reach the second flow passage 403, and reach the introduction duct from the second flow passage 403. It is taken into the air conditioner main body 70 through 365.
As described above, the work machine 1 of the present embodiment is provided on the other side of the machine body 2, the driver's seat 13 mounted on the machine body 2, and the boarding / alighting passage (boarding / alighting port 309). It is provided with an opening (opening portion) 313 that communicates the space on the floor portion 75 in front of the seat 13 with the outside of the aircraft, and a blocking member 325 that blocks the driver from getting on and off from the opening 313.

According to this configuration, the blocking member 325 can prevent the operator from getting on and off from the opening 313 on the opposite side of the boarding / alighting passage (boarding / alighting port 309).
Further, a cabin 14 having a door 172 arranged at the entrance 309 and a door 314 provided at the opening 313 is provided, and the blocking member 325 blocks the driver's entry / exit through the door 314.
According to this configuration, the blocking member 325 can prevent the operator from getting on and off from the door 314 on the opposite side of the boarding / alighting passage (boarding / alighting port 309).

Further, after the front column (second front column 142R) arranged in front of the other side of the driver's seat 13 and the rear of the front column (second front column 142R) and arranged on the other side of the driver's seat 13. A support column (second rear support column 305R) is provided, and the door 314 is provided so as to be openable and closable between the front support column (second front support column 142R) and the rear support column (second rear support column 305R).
According to this configuration, by opening the door 314, it is possible to put things in and out of the cabin room from the side opposite to the entrance / exit 309, and to clean the floor portion 75 of the cabin 14.

Further, the driver's cab 319 provided on the other side of the driver's seat 13 and the front support (second front support 142R) arranged in front of the other side of the driver's seat 13 are provided, and the blocking member 325 controls the driver. It is provided over the stand 319 and the front support (second front support 142R).
According to this configuration, the blocking member 325 can be arranged away from the driver's seat 13, and the blocking member 325 can be prevented from interfering with the operator seated in the driver's seat 13.

Further, the cockpit 319 has a control lever 16 at the front portion, and the blocking member 325 is arranged at a position superimposing on the control lever 16 along the line-of-sight direction of the operator seated in the driver's seat 13.
According to this configuration, even if the blocking member 325 is provided, it is possible to prevent the blocking member 325 from obstructing the side view of the operator.

Further, the driver's seat 13 has a seat portion 13A and a backrest portion 13B, and the blocking member 325 is formed of a rod-shaped member and extends in the front-rear direction K1 of the machine body, and is below the upper end of the control lever 16 and seated. It is arranged above the bottom surface of the portion 13A.
According to this configuration, it is possible to prevent the blocking member 325 from obstructing the visibility of the operator while preventing the operator from getting on and off.

Further, a mounting piece 326 fixed to the front strut (second front strut 142R) is provided, and the cockpit 319 has a support bracket 321 for supporting the control lever 16 and a console box 319A for covering the support bracket 321. The blocking member 325 has a front portion attached to the mounting piece 326 and a rear portion attached to the support bracket 321 in the console box 319A.

According to this configuration, the blocking member 325 can also be removed. Further, since the blocking member 325 cannot be removed unless the console box 319A is removed, it is possible to prevent the blocking member 325 from being easily removed.
Further, the door 314 has a light transmission property.
According to this configuration, the operator can visually recognize the side through the door 314, and the side view of the operator can be improved.

Further, the working machine 1 of the present embodiment includes a machine body 2, a traveling device 17 that supports the body 2 so that it can travel, a hydraulic drive device 353 that hydraulically drives the traveling device 17, and a mount member 303 on the body 2. The floor frame 72 is supplied to the hydraulic drive device 353 according to the operation of the pedals (brake pedals 111L, 111R) for braking the traveling device 17 and the pedals (brake pedals 111L, 111R). The inching valve 338 that changes the flow rate of hydraulic oil and the cable 336 that links the pedals (brake pedals 111L, 111R) and the inching valve 338 are provided, and the pedals (brake pedals 111L, 111R) and the inching valve 338 are floor frames 72. It is attached to.

According to this configuration, by interlocking the pedals (brake pedals 111L, 111R) and the inching valve 338 with the cable 336, the degree of freedom in the mounting position of the inching valve 338 can be increased. Further, by attaching the pedals (brake pedals 111L, 111R) and the inching valve 338 to the floor frame 72 supported by the body 2 via the mount member 303, that is, by attaching them to the same vibration system, the inching valve 338 can be formed. It is possible to suppress the influence of running vibration and working vibration.

Further, the floor frame 72 has an installation portion (bottom wall 74) that supports the driver's seat 13, and the inching valve 338 is attached to the installation portion (bottom wall 74) below the driver's seat 13.
According to this configuration, the inching valve 338 utilizes the space below the driver's seat 13.
Can be placed.
Further, the floor frame 72 has an inspection opening 77a, and the inching valve 338 is arranged below the inspection opening 77a and can be accessed through the inspection opening 77a.

According to this configuration, the inching valve 338 can be easily assembled and inspected through the inspection opening 77a.
Further, the floor frame 72 has a floor portion 75 in front of the installation portion (bottom wall 74), and the floor portion 75 includes a floor portion main body 77 having an inspection opening 77a and an opening / closing cover 78 that closes the inspection opening 77a. The inching valve 338 is arranged below the opening / closing cover 78.

According to this configuration, if the opening / closing cover 78 is removed, the inching valve 338 can be easily assembled and inspected.
Further, the inching valve 338 has a valve lever 338B connected to the cable 336 and a valve body 338A to which the valve lever 338B is attached, and the valve body 338A is a valve by depressing the pedals (brake pedals 111L, 111R). The lever 338B rotates about the vertical axis to change the flow rate of the hydraulic oil supplied to the hydraulic drive device.

According to this configuration, it is possible to suppress the valve lever 338B from being moved by the vertical vibration, and to prevent the speed decrease due to the valve lever 338B being moved by the vertical vibration.
Further, a hydraulic pump 349 for discharging hydraulic oil is provided, the hydraulic oil tank 344 is arranged on the side of the inching valve 338, and the valve body 338A is a first connection portion 346 connected to the discharge circuit 351 of the hydraulic pump 349. 338a on the back surface, a second connecting portion 347 connected to the hydraulic oil tank 344 on the side surface 338b on the hydraulic oil tank 344 side, and an operating shaft 345 to which the valve lever 338B is connected is provided on the upper surface 338c side.

According to this configuration, the connection between the valve body 338A and the hydraulic oil tank 344 can be simplified, and the hydraulic hose connecting the inching valve 338 and the hydraulic oil tank 344 can be shortened. Further, by arranging the hydraulic pump 349 behind the valve body 338A, the connection between the valve body 338A and the hydraulic pump 349 can be simplified. The coupling structure between the valve lever 338B and the operating shaft 345 can also be simplified.

Further, a frame member (column frame 88) standing on the front portion of the floor frame 72 and to which pedals (brake pedals 111L and 111R) are attached, and a frame member (column frame 88) fixed to the frame member (column frame 88) and one end side of the cable 336 are attached. The first cable stay 337, the mounting bracket 340 fixed to the installation part (bottom wall 74), the valve bracket 339 attached to the mounting bracket 340 and the inching valve 338 are attached, and the cable attached to the valve bracket 339. It is provided with a second cable stay 342 to which the other end side of the 336 is attached.

According to this configuration, the inching valve 338 and the second cable stay 342 can be attached to the valve bracket 339 and attached to the floor frame 72 in a sub-assembled state, and the inching valve 338 can be easily assembled.
Further, the working machine 1 of the present embodiment includes the machine body 2, the cabin 14 mounted on the machine body 2, the air conditioner main body 70 for indoor air conditioning of the cabin 14, and the air conditioner main body 70 to the inside air and the outside of the cabin 14. The inside / outside air introduction unit 368 is provided with an inside / outside air introduction unit 368 for introducing the outside air, and the inside / outside air introduction unit 368 has an inside air introduction port 381 for taking in the inside air, an outside air introduction port 387 for taking in the outside air, and an outside air for introducing the outside air from the outside air introduction port 387. An inside / outside air switching unit 370 including a switching damper 391 that can change the position between the introduction position P1 and the inside air introduction position P2 that closes the outside air introduction port 387, and an inside / outside air switching unit 370 provided adjacent to the inside / outside air switching unit 370. It also has a filter accommodating portion 369 that communicates with the air conditioner main body 70 and accommodates a filter 372 that collects dust contained in the inside air and the outside air flowing from the inside / outside air switching unit 370 to the air conditioner main body 70.

According to this configuration, it accommodates an inside / outside air switching unit 370 that switches between a state in which outside air is introduced and a state in which outside air is not introduced, and a filter 372 that removes dust from the inside air and the outside air that flow from the inside / outside air switching unit 370 to the air conditioner main body 70. The filter 372 can be shared by providing the filter accommodating portion 369 adjacent to the filter accommodating portion 369. Further, since the inside air introduction port 381, the outside air introduction port 387, and the switching damper 391 are provided at one place, the inside / outside air switching portion 370 can be formed compactly.

Further, it includes a prime mover 352 and a partition member 389 forming the front surface of the prime mover chamber E1 for accommodating the prime mover 352, and the outside air introduction port 387 is arranged in the machine body 2 and on the front side of the partition member 389.
According to this configuration, the intake of outside air can be reduced from being affected by the exhaust gas discharged from the prime mover 352.

Further, the driver's seat 13 mounted on the machine body 2 is provided, and the inside / outside air introduction unit 368 is arranged behind the driver's seat 13 and has an inclined front wall 374 that shifts upward toward the rear and a front. It has a bottom wall 377 extending rearward from the wall 374, the inside air introduction port 381 is formed on the front wall 374 side and above the bottom wall 377, and the outside air introduction port 387 is formed on the bottom wall 377, inside and outside. The air switching unit 370 is operated from the driver's seat 13 side with the support boss 399 arranged below the inside air introduction port 381 and in front of the outside air introduction port 387, and is pivotally supported by the support boss 399 and the switching damper 391. Has a fixed switching lever 395.

According to this configuration, the positional relationship between the inside air introduction port 381 and the outside air introduction port 387 can be made close to each other, and the inside / outside air switching unit 370 can be formed compactly.
Further, a fuel tank 390 arranged below the inside / outside air switching portion 370 is provided, and the bottom wall 377 is a first portion 377a constituting the bottom portion of the inside / outside air switching portion 370 and a first portion 377a constituting the bottom portion of the filter accommodating portion 369. It has two sites 377b, and the first site 377a is formed at a position higher than that of the second site 377b.

According to this configuration, the height of the fuel tank 390 can be increased, and the capacity of the fuel tank 390 can be increased.
Further, an introduction duct 365 which is arranged above the air conditioner main body 70 and communicates with the air conditioner main body 70 is provided, and the inside / outside air switching unit 370 and the filter accommodating unit 369 are arranged side by side in the body width direction K2, and the filter 372. The filter surface 372a is arranged vertically so that the filter surface 372a faces the front and back, the inside / outside air switching unit 370 communicates with the back side of the filter 372 in the filter accommodating unit 369, and the introduction duct 365 is on the front side and the lower side of the filter 372. It has an introduction port 365c connected to the filter accommodating portion 369.

According to this configuration, the filter accommodating portion 369 can be formed compactly.
Although one embodiment of the present invention has been described above, it should be considered that the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is shown not by the above description but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

2 Aircraft 17 Traveling device 72 Floor frame 74 Installation part (bottom wall)
75 Floor part 77 Floor part body 77a Inspection opening 78 Opening and closing cover 88 Frame member (column frame)
111L pedal (brake pedal)
111R pedal (brake pedal)
303 Mounting member 336 Cable 337 1st cable stay 338 Inching valve 338a Back 338b Side 338c Top 338A Valve body 338B Valve lever 339 Valve bracket 340 Mounting bracket 342 2nd cable stay 344 Hydraulic oil tank 345 Operation shaft 346 1st connection 347 2 Connection 349 Hydraulic pump 351 Discharge circuit 353 Hydraulic drive

Claims (7)

With the aircraft
A traveling device that supports the aircraft so that it can travel,
A hydraulic drive device that hydraulically drives the traveling device, and
A floor frame supported by the airframe via a mounting member,
A pedal for braking the traveling device and
An inching valve that changes the flow rate of hydraulic oil supplied to the hydraulic drive according to the operation of the pedal.
A cable for interlocking the pedal and the inching valve is provided.
The pedal and the inching valve are working machines attached to the floor frame. The floor frame has an installation portion that supports the driver's seat.
The working machine according to claim 1, wherein the inching valve is attached to the installation portion below the driver's seat. The floor frame has an inspection opening and
The working machine according to claim 2, wherein the inching valve is arranged below the inspection opening and is accessible through the inspection opening. The floor frame has a floor portion in front of the installation portion.
The floor portion has a floor portion main body having the inspection opening and an opening / closing cover for closing the inspection opening.
The working machine according to claim 3, wherein the inching valve is arranged below the opening / closing cover. The inching valve has a valve lever connected to the cable and a valve body to which the valve lever is attached.
The valve body according to any one of claims 1 to 4, wherein the valve lever rotates about the vertical axis by operating the pedal to change the flow rate of hydraulic oil supplied to the hydraulic drive device. Working machine. It is equipped with a hydraulic pump that discharges the hydraulic oil.
The hydraulic oil tank is arranged on the side of the inching valve.
The valve body has a first connection portion connected to the discharge circuit of the hydraulic pump on the back surface, and a second connection portion connected to the hydraulic oil tank on the side surface on the hydraulic oil tank side. The working machine according to claim 5, wherein the operating shaft to which the valve lever is connected is provided on the upper surface side. A frame member that stands on the front of the floor frame and to which the pedal is attached,
A first cable stay fixed to the frame member and to which one end side of the cable is attached,
With the mounting bracket fixed to the installation part,
A valve bracket that is attached to the mounting bracket and to which the inching valve is attached,
The working machine according to any one of claims 2 to 4, further comprising a second cable stay attached to the valve bracket and attached to the other end side of the cable.

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