JP7191756B2 - work machine - Google Patents

Description

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

BACKGROUND ART Conventionally, a working machine disclosed in Patent Document 1 is known.
The work machine disclosed in Patent Document 1 has a cabin that surrounds a driver's seat mounted on the machine body. This cabin has doors for getting on and off that can be opened and closed on one side and the other side of the driver's seat. Therefore, with the technique of Patent Document 1, it is possible to get into and out of the cabin from both one side and the other side of the driver's seat.

JP 2019-7227 A

By the way, depending on the work machine, one side of the driver's seat may be used as an aisle for getting on and off, and getting on and off from the other side may be prohibited.
SUMMARY OF THE INVENTION An object of the present invention is to prevent a driver from getting in and out of a vehicle from the opposite side of the aisle for getting on and off.

A work machine according to an aspect of the present invention includes a machine body, a driver's seat mounted on the machine body, and a boarding and alighting passage provided on one side of the driver's seat. An opening that communicates the space on the floor in front of the driver's seat with the outside of the fuselage; and a blocking member provided at a position that interferes with the

According to the above configuration, by providing an aisle for getting on and off on one side of the driver's seat and providing an opening on the other side, there is an advantage that ventilation can be improved, and cleaning work of the floor etc. can be performed. The advantage is that it is easy to do. In addition, the blocking member can prevent the driver from getting on and off the vehicle through the opening on the side opposite to the passage for getting on and off.

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 portion of the working machine. It is a perspective view of a cabin frame. Fig. 3 is a perspective view of the front part of the cabin; It is a right side view of a cabin. FIG. 4 is a perspective view of an attachment portion of a blocking member; FIG. 11 is a perspective view of a rear mounting portion of the blocking member; It is the perspective view which looked at the interruption|blocking member from the driver's seat side. It is the perspective view which looked at the floor frame from the back upper part. It is the 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. FIG. 4 is a cross-sectional view of the support structure for the brake pedal; It is a perspective view which shows the relationship between a brake arm and a cable. FIG. 4 is a configuration diagram showing an inching valve attachment portion and a travel system hydraulic circuit; FIG. 4 is a side view of the mounting portion of the inching valve; FIG. 4 is a perspective view of a mounting portion of the inching valve; It is a front perspective view inside a cabin room. It is a perspective view of the floor frame rear part. 4 is a cross-sectional view of an inside/outside air switching unit; FIG. It is a sectional view of a filter seat part. It is a cross-sectional view of the rear part of the fuselage. It is a cross-sectional view of an inside/outside air introducing section.

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

In this 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 rearward, and the left side of the operator. (Front side in FIG. 1, direction of arrow B1 in FIG. 2) is defined as left side, and operator's right side (back side in FIG. 1, direction of arrow B2 in FIG. 2) is defined as right side.
Also, the horizontal direction perpendicular to the fuselage longitudinal direction K1 will be described as the fuselage width direction K2 (see FIG. 2). Also, the direction toward the right or left from the central portion in the width direction of the fuselage 2 will be described as the outward direction of the fuselage. That is, the outer side of the fuselage is a direction away from the center of the fuselage 2 in the fuselage width direction K2. The direction opposite to the outer side of the fuselage will be described as the inner side of the fuselage. In other words, the inward direction of the fuselage is a direction approaching the center of the fuselage 2 in the fuselage width direction K2.

As shown in FIG. 1, a body connecting member 5 is provided on the front end side of the rear body 2B so as to be rotatable within a predetermined range about an axis in the longitudinal direction K1 of the body. The side is connected so as to be swingable in the body width direction K2 around the vertical axis (the axis extending in the vertical direction).
A steering cylinder 6 composed of a hydraulic cylinder is provided across the body connecting member 5 and the front body 2A. By extending and contracting the steering cylinder 6, the front body 2A swings relative to the rear body 2B in the body width direction K2, so that the working machine 1 can turn left and right.

A cabin 14 as a driver's seat protection device surrounding a driver's seat 13 is provided in the rear fuselage 2B. A steering wheel 15 (steering wheel) for operating the steering cylinder 6 and a control lever 16 for operating the work device 7 are provided in the room of the cabin 14 . A steering wheel 15 is arranged in front of the driver's seat 13 , and a control lever 16 is arranged to the side (right side) of the driver's seat 13 .

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

As shown in FIGS. 1 and 2, a working device 7 (front working device) is provided on the front body 2A. The working device 7 has a lift arm 8 supported by the front body 2A (body 2) so as to be vertically swingable. The lift arm 8 has a left first arm 8L and a right second arm 8R spaced apart in the body width direction K2. The base end side (rear end side) of the first arm 8L is rotatably supported on the upper part of the first support frame 10L erected on the left side of the front body 2A about an axis extending in the body width direction K2. ing. Therefore, the first arm 8L can swing up and down. The base end of the second arm 8R is rotatably supported on an upper portion of a second support frame 10R erected on the right side of the front body 2A about an axis extending in the body width direction K2. Therefore, the second arm 8R can also swing up and down. A work light 33L is provided on the upper left side 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 spaced apart in the body width direction K2, and the space is gradually widened forward. As a result, the visibility of the operator seated in the driver's seat 13 in the diagonally forward left direction and the diagonally forward right direction is improved. This facilitates confirmation of the front wheels 3L and the front wheels 3R. Therefore, the work can be easily performed while looking at the front wheels 3L and 3R. In addition, the work can be performed while looking at the portion of the working tool 9 on the outer side of the machine body. For example, when a pallet fork is attached as the working tool 9, it is possible to work while looking at the tip 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 across the longitudinal middle portion of the first arm 8L and the vertical middle portion of the first support frame 10L. A lift cylinder 11R is provided between the longitudinal middle portion of the second arm 8R and the vertical middle portion of the second support frame 10R. The lift cylinder 11L and the lift cylinder 11R are composed of double-acting hydraulic cylinders. By extending and contracting the lift cylinder 11L and the lift cylinder 11R, the lift arm 8 (the first arm 8L and the second arm 8R simultaneously) swings up and down.

As shown in FIGS. 1 and 2, the working device 7 has a working tool 9 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, a mania fork, or a work tool (hydraulic attachment) having a hydraulic actuator such as a sweeper, a mower, or a breaker can be used. can be installed. A lower back surface of the work tool 9 is connected to and pivotally supported on the tip side (front end side) of the lift arm 8 .

As shown in FIG. 1 , the work implement 1 has a work implement cylinder 12 that drives a work implement 9 . The work tool cylinder 12 is composed of a double-acting hydraulic cylinder. A bracket member 27 is fixed to the connecting pipe 26 , and the vertical middle portion of the swing link 28 is pivotally supported by the bracket member 27 . One end of the work implement cylinder 12 is connected to the upper portion of the swing link 28 . The other end of the work implement 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). A rear portion of an interlocking link 31 is pivotally supported on a lower portion of the rocking link 28 . The front portion of the interlocking link 31 is pivotally supported (engaged) with the upper back surface of the work implement 9 . By extending and contracting the work implement cylinder 12, the swing link 28 swings and the interlocking link 31 moves back and forth. As a result, the work implement 9 swings up and down around the connection point with the lift arm 8 .

The front wheel 3L is provided in front of the first support frame 10L and to the left of the first arm 8L. Further, the front wheel 3L is positioned behind the left portion of the work tool 9. As shown in FIG. The front wheel 3R is provided forward of the second support frame 10R and to the right of the second arm 8R. Further, the front wheel 3R is positioned behind the right portion of the work tool 9. As shown in FIG.
As shown in FIG. 3, the rear body 2B has a body frame 71. As shown in FIG. The body frame 71 is movably supported by the rear wheels 4L and the rear wheels 4R. A body connecting member 5 is attached to the front part of the body frame 71 . As shown in FIG. 1 , a bonnet 301 that covers the motor 352 from above and a weight 302 arranged below the bonnet 301 are provided at the rear portion of the body frame 71 . As shown in FIG. 19, the bonnet 301 and the weight 302 form a prime mover room (engine room) E1 in which a prime mover 352 is accommodated.

As shown in Figures 3-5B, the cabin 14 has a mounting member 303 having a resilient material. A plurality of mount members 303 are provided. In this embodiment, four mount members (first mount member 303A, second mount member 303B, third mount member 303C, and 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. As shown in FIG. 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 body frame 71 (the body 2) via a mount member 303, and is supported by the body frame 71 in an anti-vibration manner.

As shown in FIG. 4, the cabin 14 has a cabin frame 304 forming a skeleton. Cabin frame 304 has a plurality of front struts (first front strut 142L, second front strut 142R) and a plurality of rear struts (first rear strut 305L, second rear strut 305R).
As shown in FIG. 4 , the first front strut 142L is provided on the left side of the front portion of the cabin 14 . Specifically, the first front strut 142L is arranged forward and to the left (one side) of the driver's seat 13 (see FIG. 5A). The second front strut 142R is provided on the right side of the front portion of the cabin 14 . Specifically, the second front strut 142R is arranged forward and to the right (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 strut 305L is arranged at an intermediate portion of the left side surface of the cabin 14 in the longitudinal direction K1 of the aircraft. The second rear strut 305R is provided behind the second front strut 142R. Specifically, the second rear strut 305R is arranged on the right side of the cabin 14 at an intermediate portion in the longitudinal direction K1 of the aircraft.

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 a first tilt frame 306L and a first connecting frame 307L. The first slanted frame 306L extends from the lower end of the first rear strut 305L in a forward-downward slanting 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 strut 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 a second tilt frame 306R and a second connecting frame 307R. The second slanted frame 306R extends from the lower end of the second rear strut 305R in a forward-downward slanting 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 strut 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 strut 142L. The first upper frame 308L is connected to the upper end of the first rear strut 305L and extends rearward beyond 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 strut 142R. The second upper frame 308R is connected to the upper end of the second rear strut 305R and extends rearward beyond the second rear strut 305R.

As shown in FIG. 4, an opening formed by the first front support column 142L, the first rear support column 305L, the first inclined frame 306L, the first connecting frame 307L and the first upper frame 308L is a boarding/alighting opening ( Passage for getting on and off) 309. In other words, an aisle for getting on and off is provided on the left side (one side) of the driver's seat 13 . Therefore, the first front strut 142L forms the front portion of the entrance/exit 309, and the first rear strut 305L forms the rear portion of the entrance/exit 309. As shown in FIG.

As shown in FIG. 1, the boarding/alighting opening 309 is closed by a boarding/alighting door (door) 172 so that it can be opened and closed. Specifically, the passenger door 172 is provided between the first front column 142L and the first rear column 305L, and is rotatably supported on the first rear column 305L by a hinge member about the vertical axis. A boarding/alighting step 311 and a handrail 312 are provided on the left side of the cabin 14 to assist the operator in boarding/alighting the cabin 14 . The boarding/alighting step 311 is provided below the boarding/alighting door 172 . The handrail 312 is provided on the first front support column 142L and the first rear support column 305L, as shown in FIG. The passenger door 172 includes a light transmissive panel 172A. For example, the panel 172A is made of a transparent glass plate. The panel 172A is sized and shaped to cover the entrance/exit 309 . Further, the passenger 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 ( open portion) 313. This opening 313 is closed by a door 314 so as to be openable and closable, as shown in FIG. Specifically, the door 314 is provided between the second front column 142R and the second rear column 305R, and is rotatably supported on the second rear column 305R by a hinge member 315 about the vertical axis. Therefore, when the door 314 is opened with the opening 313 closed, the space on the floor 75 in front of the driver's seat 13 communicates with the outside of the airframe 2 through the opening 313 . Further, the door 314 includes a panel 314A having light translucency. For example, the panel 314A is made of a transparent glass plate. The panel 314</b>A is sized and shaped to cover 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 take things in and out of the cabin from the side opposite to the entrance/exit 309 and to clean the cabin. Further, in this embodiment, the lower end of the opening 313 is at the same height as 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 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 translucency, visibility on the right side of the cabin 14 can be improved.

As shown in FIG. 3, between the first front support column 142L and the second front support column 142R, a front panel 141 is provided at the upper portion, and a cover panel 147 is provided at the lower portion. The front panel 141 is made of a transparent glass plate or the like and has translucency. The cover panel 147 is made of an opaque member. A roof 317 is provided between the first upper frame 308L and the second upper frame 308R. At the rear of the cabin frame 304, a rear panel 318 made of a transparent glass plate or the like and having light transmission properties is provided. The rear panel covers the side rear and rear sides 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 (on which the buttocks and thighs are placed). The backrest portion 13B is a portion on which a seated operator leans the back, and is provided so as to extend upward at the rear portion of the seat portion 13A.
As shown in FIGS. 5B and 7B , a control table 319 is provided on the right side (the other side) of the driver's seat 13 . A control lever 16 is provided on the front part of the control table 319 on the inside of the aircraft body. An armrest 320 is provided on the control platform 319 . The armrest 320 is arranged behind the control lever 16 . Armrest 320 is arranged on the right side of driver's seat 13 .

The cockpit 319 has a console box 319A. Console box 319A is attached to cabin frame 304 . Various switches are collectively 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 an inclined wall 72a of a floor frame 72, which will be described later. The support bracket 321 is provided inside the front portion of the console box 319A. The front part of the console box 319A is attached to the support bracket 321 and supported.

The steering 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 operation valve that pilot-operates control valves that control the lift cylinders 11L and 11R and control valves that control the work implement cylinder 12 . The remote control valve 322 is arranged on the lower side of the support bracket 321 and fixed to the mounting plate 333 attached to the support bracket 321, as shown in FIG. 7A. Remote control valve 322 is covered by console box 319A together with support bracket 321 . The control lever 16 protrudes from the console box 319A, and its base is covered with a boot member 334 (see FIG. 5A).

As shown in FIGS. 4, 5A, and 5B, the work implement 1 (cabin 14) has a blocking member 325 that blocks an operator from getting in and out of the vehicle through an opening 313 on the right side of the driver's seat. That is, in this embodiment, the opening 313 is not used as a boarding/alighting opening (passage for boarding/alighting) for the operator to board/alight. Therefore, in this embodiment, the right side surface of the cabin 14 is not provided with a step for getting on and off, a handrail, or the like. The blocking member 325 is formed of a rod-shaped member such as a pipe material, and is provided across the control platform 319 and the second front strut 142R. As a result, the operator can be made aware that the opening 313 is not a 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 to extend in the longitudinal direction K1 (horizontal direction) of the fuselage, and is arranged below the upper end of the control lever 16 and above the bottom surface of the seat portion 13A. ing. Thereby, the shielding member 325 can be arranged at a position that does not interfere with the operator's field of view sitting on the driver's seat 13 while preventing 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 overlapping the control lever 16 along the line of sight of the operator seated in the driver's seat 13 . In other words, when the operator sits on the driver's seat 13 , when the operator sees the blocking member 325 , part or all of the blocking member 325 is hidden by the control lever 16 . This prevents the blocking member 325 from obstructing the operator's field of vision.

As shown in FIG. 6, the blocking member 325 has a front portion attached to the second front strut 142R and a rear portion attached to the support bracket 321. As shown in FIG. Specifically, a mounting piece 326 is fixed to the second front strut 142</b>R, and a mounting stay (referred to as a first mounting stay) 327 is fixed to the front portion of the blocking member 325 . A bolt 328 is passed through the mounting piece 326 and the first mounting stay 327 from the outer side of the fuselage, and the bolt 328 is screwed into a nut fixed to the surface of the first mounting stay 327 on the inner side of the fuselage. As a result, the front portion of the blocking member 325 is attached to the second front strut 142R. 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 portion 329a whose plate surface faces the longitudinal direction K1 of the fuselage, and a second portion 329b that extends rearward from the end of the first portion 329a on the inward side of the fuselage. A blocking member 325 is fixed to the upper portion of the first portion 329a. A bolt 330 is passed through the second portion 329b and the side wall 321a on the outboard side of the support bracket 321 from the outboard side of the fuselage, and the bolt 330 is screwed into a nut fixed to the inboard surface of the side wall 321a. is Thereby, the rear portion of the blocking member 325 is attached to the support bracket 321 .

When bolts 328 and 330 are removed, blocking member 325 can also be removed. However, since the rear portion of the blocking member 325 and the second mounting stay 329 are accommodated in the console box 319A together with the support bracket 321, they are constructed so as not to 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 as an elongated hole extending in the longitudinal direction K1 of the machine body. This makes it possible to absorb mounting errors (manufacturing errors) when mounting the blocking member 325 .

In addition, in the present embodiment, the case where the blocking member 325 is applied to the working machine 1 on which the cabin 14 is mounted has been illustrated, but the present invention is not limited to this. For example, the blocking member 325 can also be applied to the working machine 1 equipped with a canopy having an opening behind the front strut that allows the space on the floor 75 in front of the driver's seat 13 to communicate with the outside of the machine body 2 .
As shown in FIG. 4, the working machine 1 has a floor frame 72 mounted on a body frame 71 (machine body 2). Floor frame 72 is fixed to the lower portion of cabin frame 304 . That is, the floor frame 72 constitutes the lower portion of the cabin 14 . Therefore, the floor frame 72 and the cabin 14 are supported by the fuselage frame 71 via the mount member 303 in an anti-vibration manner.

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 portions 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 positioned below the floor 75 . Therefore, a space is provided 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 that closes the inspection opening 77a. The opening/closing cover 78 is detachably attached to the floor main body 77 with bolts or the like. The floor body 77 has a first portion 79 , a second portion 80 and a third portion 81 .
As shown in FIGS. 8A and 8B , the first portion 79 constitutes the left portion of the floor main body 77 . A rear portion 79a of the first portion 79 is narrower than a front portion 79b in the body width direction K2. Specifically, the rear portion 79a is located on the outer side (left side) of the fuselage with respect to the first side wall 73L, and the front portion 79b has a portion extending forward from the rear portion 79a and a portion extending forward from the rear portion 79a. It has a part that extends inside the body (to the right).

The second part 80 constitutes the right part of the floor main body 77 . A rear portion 80a of the second portion 80 is narrower than a front portion 80b in the body width direction K2. More 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 is more maneuverable than the rear portion 80a from this portion. It has a part that extends inside the body (to the left).

The floor frame 72 has an inclined wall 72a extending in an inclined direction that shifts upward as it goes rearward from the rear end of the rear portion 80a. A support bracket 321 is fixed to the inclined wall 72a (see FIG. 7A).
The third portion 81 is positioned in the center in the machine width direction K2 and between the front portion 79b of the first portion 79 and the front portion 80b of the second portion 80. As shown in FIG. The third portion 81 connects the front portion 79b and the front portion 80b. Specifically, the third portion 81 connects the rear sides of the front portion 79b and the front portion 80b. The third portion 81 is formed in a recess that is recessed downward.

An opening is provided between the rear portion 79a of the first portion 79 and the rear portion 80a of the second portion 80, and this opening is an inspection opening 77a. When the rubber mat 332 and the opening/closing cover 78 are removed, the equipment and the like arranged inside the body 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 part of the cabin. The steering column 87 is positioned in the center of the cabin in the machine width direction K2.

As shown in FIG. 8A , the steering column 87 has a column frame (frame member) 88 erected on the front portion of the floor frame 72 . Further, the steering column 87 has a column cover 89 that covers the column frame 88, as shown in FIG. 5A.
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 body width direction K2. The column frame 88 is positioned forward of the third portion 81 . The column frame 88 has a first side wall 88L and a second side wall 88R spaced apart in the body width direction K2. The first side wall 88L constitutes the left portion of the column frame 88 and stands on the floor portion 75. As shown in FIG. The second side wall 88</b>R constitutes the right portion of the column frame 88 and stands upright 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 portions 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. A steering valve 90 for controlling 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 side of the steering column 87 is covered with the front panel 141 and the cover panel 147 .
As shown in FIGS. 9A and 9B, on the left side of the column frame 88, a brake pedal (referred to as a first brake pedal) 111L is arranged. 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 axis extending in the body width direction K2 is provided on the top of the column frame 88 . The brake shaft 112 is made of a single rod, passes through the upper and front portions of the first side wall 88L and the second side wall 88R, and is supported by these side walls 88L and 88R so as to be rotatable about the axis.

A left portion of the brake shaft 112 protrudes leftward from a bearing boss 113 fixed to the outside of the first side wall 88L. An upper portion 114L of the first brake pedal 111L is fixed to this projecting portion. Therefore, the first brake pedal 111L rotates together with the brake shaft 112 . Below the first brake pedal 111L, there is provided a stepping portion 115L that is stepped on by an operator. 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 protrudes outward from the second side wall 88R. A pedal boss 114R provided above the second brake pedal 111R is attached to the right portion of the brake shaft 112. As shown in FIG. Therefore, the second brake pedal 111R also rotates integrally with the brake shaft 112 . A stepping portion 115R that is stepped on by the operator is also provided below the second brake pedal 111R. That is, the second brake pedal 111R is also a suspension type brake pedal.

As shown in FIG. 10, the brake shaft 112 has a connection 116 formed by a spline on its right side. The coupling portion 116 is formed up to the right end of the brake shaft 112 . A bushing 117 that supports the brake shaft 112 is fixed to the inner upper portion of the second side wall 88R. The bushing 117 penetrates the second side wall 88R and protrudes inward from the second side wall 88R. The bushing 117 has openings at both ends in the axial direction, and the coupling portion 116 is inserted through the bushing 117 . Coupling portion 116 protrudes from the left end of bushing 117 . A brake arm 118 is arranged to the left of the bushing 117 . Brake arm 118 has an arm boss 119 fitted to coupling portion 116 and an arm portion 120 fixed to arm boss 119 . Arm boss 119 is spline-connected to connecting portion 116 and rotates integrally with brake shaft 112 . The arm boss 119 also has a bearing portion 119 a that is inserted into the bushing 117 . The brake shaft 112 is supported by the bushing 117 via the bearing portion 119 a and the bush 121 .

As shown in FIG. 10, the connecting portion 116 has a protruding portion 116a protruding from the right end portion of the bushing 117 to the outside of the vehicle body (toward the side opposite to the side on which the first brake pedal 111L is arranged). . The pedal boss 114R is fitted from the right to the projecting portion 116a and is spline-coupled to rotate integrally with the brake shaft 112. As shown in FIG. The pedal boss 114R has a pivot portion 132 that is inserted into the bushing 117. As shown in FIG. A bushing 133 provided on the inner peripheral side of the bushing 117 is fitted to the outer periphery of the shaft support portion 132 . The brake shaft 112 is supported by the bushing 117 via a shaft support portion 132 and a bushing 133 .

As shown in FIG. 11 , one end of a connecting link 122 is pivotally supported on 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 through the connecting link 122. . As a result, the master cylinder 123 operates, and the braking 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 regulating rod 129 is provided between the first contact portion 120a and the second contact portion 120b. As shown in FIGS. 9A and 9B, the regulating rod 129 is fixed to the second side wall 88R so as to protrude inward of the fuselage. The contact of the first contact portion 120a with the regulating rod 129 restricts the rocking of the first brake pedal 111L and the second brake pedal 111R in the direction opposite to the direction of depression (opposite direction). The position of the brake pedals 111L and 111R in a state where the first contact portion 120a is in contact with the regulating rod 129 is the position before depression. Further, the second contact portion 120b abuts against the regulating rod 129, thereby regulating the rocking motion of the first brake pedal 111L and the second brake pedal 111R in the depression direction.

As shown in FIGS. 9A and 9B, a return spring 131 is provided on the right side between the first side wall 88L and the second side wall 88R to return the brake pedals 111L and 111R to the position before the operation (set position when not operated). are placed. The return spring 131 is composed of a torsion coil spring and is provided so as to surround the brake shaft 112 . In this embodiment, the return spring 131 is provided so as to surround the outer circumference of the bushing 117 . One end (left end) 131a of the return spring 131 is engaged with the brake arm 118 (see FIG. 11). The other end (right end) 131 b of the return spring 131 is hooked on the regulating rod 129 . As a result, the return spring 131 urges the first brake pedal 111L and the second brake pedal 111R in the anti-depression direction.

As shown in FIG. 11, a connecting rod 335 is fixed to the distal end side of the arm portion 120 so as to protrude outward from the body. One end of the cable 336 is pivotally connected to one end of the connecting rod 335 (outer end of the fuselage). 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. As shown in FIG. A first cable stay 337 is fixed to the surface of the second side wall 88R on the inner side of the fuselage. The first cable stay 337 is provided at the rear and lower portion of the second side wall 88R. One end of the cable 336 is attached to the first cable stay 337 . Specifically, an outer cable 336B is attached to the first cable stay 337 . As shown in FIG. 12 , the cable 336 is routed below the floor frame 72 through a 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 body 77. As shown in FIG.

The cable 336 is a cable that interlocks and connects the brake arm 118 (brake pedals 111L, 111R) and an 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 . An 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 viewed from below. As shown in FIG. 12, inching valve 338 is located on the right side of bottom wall 74 .

As shown in FIG. 14, the inching valve 338 is mounted on a valve bracket 339 which is mounted on a 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 top surface of the bottom wall 74 so that the front end 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 machine width direction K2. , and 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 attachment portion 339b is superimposed on the front surface of the attachment wall 340a and attached with bolts 341. As shown in FIG.

As shown in FIG. 14, a second cable stay 342 to which the other end 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 superimposed on the front surface of the bracket mounting portion 339b and fixed by bolts 343. As shown in FIG. The second wall portion 342b extends forward from the end of the first wall portion 342a on the outer side of the aircraft body. The third wall portion 342c extends inward from the second wall portion 342b. Specifically, the third wall portion 342c extends in an inclined direction moving forward toward the inside of the fuselage. An 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. As shown in FIG. The valve body 338A has a first connecting portion 346 on the rear 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 a discharge circuit 351 of a hydraulic pump 349 via a hydraulic hose (first hydraulic hose) 350 . The hydraulic pump 349 is, for example, a constant displacement pump, which is connected to the side of the prime mover 352 and driven by the power of the prime mover 352 . Also, the hydraulic pump 349 discharges hydraulic oil stored in a hydraulic oil tank (tank) 344 . Specifically, the hydraulic pump 349 discharges hydraulic oil (pilot oil) for hydraulically controlling the hydraulic drive device 353 . The hydraulic oil tank 344 is arranged on the left side of the inching valve 338 (on the side where the second connecting portion 347 is provided). The second connection portion 347 is connected to the hydraulic fluid 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 by hydraulic pressure. More specifically, the HST 353 of this embodiment is connected to an HST pump 355, which is a swash plate type variable displacement pump driven by the power of a prime mover 352, and the HST pump 355 and a pair of oil passages 356a, 356b in a closed circuit connection. and an HST motor 357 that drives the traveling device 17 by being driven by the oil discharged from the HST pump 355 .

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

When the pilot oil is supplied from the forward/reverse switching valve 359 to the forward oil passage 360 , the servo cylinder 358 swings the swash plate 355 A toward the forward direction so that the pilot oil is supplied from the forward/reverse switching valve 359 to the reverse oil passage 361 . When the pilot oil is supplied, the swash plate 355A is swung backward, and when the pilot oil is not supplied to the forward oil passage 360 and the reverse oil passage 361, the swash plate 355A is held at the neutral position.

The valve body 338A (inching valve 338) is formed by a rotary valve, and the operating shaft 345 is integrally formed (or formed separately and connected to) the rotary spool of the valve body 338A. The operating shaft 345 is rotatable about the vertical axis, and by rotating about 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 connection oil passage connecting the first connection portion 346 and the second connection portion 347 is cut off. As a result, the pilot oil discharged from the hydraulic pump 349 can be supplied to the forward/reverse switching valve 359, and the swash plate 355A swings forward or backward according to switching of the forward/reverse switching valve 359. When the inching valve 338 is switched to the ON state (open state), the connection oil passage connecting the first connection portion 346 and the second connection 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, if the swash plate 355A is swinging forward or backward, the swash plate 355A moves to the neutral side, and the travel device 17 decelerates or stops. Since the valve opening 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 controlled by the inching valve 338. can be adjusted by

As shown in FIG. 14, one end of the valve lever 338B is clamped and fixed to the operating shaft 345. As shown in FIG. Therefore, the valve lever 338B can rotate together with the operation shaft 345 about the vertical axis (the axis of the operation shaft 345). The other end of the cable 336 is connected to the other end of the valve lever 338B. Specifically, the other end of the inner cable 336A is connected to the other end 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.

When the brake pedals 111L and 111R are not depressed, as shown in FIG. 14, the valve lever 338B projects forward from the operating shaft 345, and the inching valve 338 is off. When the brake pedals 111L and 111R are depressed, the brake arm 118 (arm portion 120) swings downward, pushing the cable 336 (inner cable 336A). Then, the valve lever 338B is pushed by the cable 336 and rotates together with the operation shaft 345 around the vertical axis. That is, when the brake pedals 111L and 111R are stepped on, the valve lever 338B swings leftward about the vertical axis (the axis of the operation shaft 345) to rotate the operation shaft 345. As shown in FIG. As a result, the inching valve 338 is turned on, the swash plate 355A is returned to the neutral position, and power is not output from the HST 353 to the traveling device 17. Therefore, by stepping on the brake pedals 111L and 111R, the brake device is operated to brake the traveling device 17 and the HST 353 is brought into 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 airframe 2 via the mount member 303. As shown in FIG. That is, the brake pedals 111L and 111R and the inching valve 338 are attached to the same vibration system. Therefore, the brake pedals 111L, 111R, the cable 336 and the inching valve 338 move together with the floor frame 72 due to the vibration of the machine body 2, so that the inching valve 338 can be restrained from being affected by running vibration and working vibration.

Further, by interlocking the brake pedals 111L, 111R and the inching valve 338 with the cable 336, the degree of freedom of the mounting position of the inching valve 338 can be increased.
Vibration of the airframe 2 is mostly vertical vibration (vertical vibration), but the valve lever 338B is attached to the valve main body 338A so as to be rotatable about the vertical axis. Since it is a structure that operates the inching valve 338, it is possible to suppress the movement of the valve lever 338B due to the vertical vibration of the machine body 2, and to prevent the valve lever 338B from being moved by the vertical vibration and reducing the running speed. .

As shown in FIG. 13 , a seat base 76 is attached to the bottom wall 74 , and the driver's seat 13 is attached to the seat base 76 . Specifically, the driver's seat 13 is attached to a 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. A mounting wall 76c extends from the lower end of the front wall 76b and is fixed to the front portion of the bottom wall 74 with bolts. The seat base 76 has a support leg 76d to which an opening/closing cover 78 is attached. Specifically, the support leg 76d extends upward from the front end of the mounting wall 76c and has an upper portion bent forward. The rear portion of the opening/closing cover 78 is detachably attached to the upper portion of the support leg 76d by bolts 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 laid on the floor 75 and the opening/closing cover 78 . As a result, inspection and assembly of the inching valve 338 and the like can be performed.

When assembling the inching valve 338 to the cabin 14 , first, before assembling the cabin 14 to the body frame 71 , the inching valve 338 and the second cable stay 342 are attached to the valve bracket 339 for subassembly. The first hydraulic hose 350 is connected to the hydraulic pump 349 side, and the second hydraulic hose 354 is connected to the hydraulic fluid tank 344 . The cabin 14 is assembled with the brake pedals 111L and 111R, the brake arm 118, the cable 336, and the like, and with the opening/closing cover 78 removed, the cabin 14 is suspended from above the body frame 71 and assembled via the mount member 303. After assembling the cabin 14 to the body frame 71 , the cable 336 is attached to the second cable stay 342 through the inspection opening 77 a and the first hydraulic hose 350 and the second hydraulic hose 354 are attached to the inching valve 338 . The valve bracket 339 is attached to the mounting bracket 340 in this state. 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 the cabin is arranged at the rear portion of the floor frame 72 . Further, the air conditioner main body 70 is arranged at a position deviated leftward from the central portion of the floor frame 72 in the body width direction K2. An introduction duct 365 is provided above the air conditioner body 70 to introduce inside air (air inside the cabin) and outside air (air outside the cabin) into the air conditioner body 70 . A first guide duct 366 is arranged on the right side of the air conditioner main body 70 to guide the conditioned air blown out from the air conditioner main body 70 to the front part of the cabin 14 . A second guide duct 367 that guides the conditioned air flowing through the first guide duct 366 to the rear of the cabin 14 is arranged on the right side of the first guide duct 366 .

As shown in FIG. 13 , the air conditioner body 70 is arranged below the driver's seat 13 (within the seat base 76 ) and attached to the bottom wall 74 . The air conditioner main body 70 has a case 70A and a blower 70B and an evaporator housed in the case 70A, and constitutes a main body of an air conditioner installed in the working machine 1. As shown in FIG. Also, the air conditioner main body 70 is arranged in front of a rear lower wall 371 forming a lower rear surface of the floor frame 72 . The rear lower wall 371 extends over the first side wall 73L and the second side wall 73R, as shown in FIG. 8B. The rear lower wall 371 includes 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 shifts upward as it goes rearward from the upper end of the first wall portion 371a. and A left wall portion 371c of the second wall portion 371b extends upward beyond 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 body 365a that communicates with the inside of the air conditioner body 70, and an extension duct 365b that extends in an oblique direction that shifts upward as it goes rearward from the duct body 365a. . The upper end of extension duct 365b is open. An upper portion of the extension duct 365b is an introduction port 365c for introducing air.
As shown in FIG. 15 , an inside/outside air introducing portion 368 for introducing inside air and outside air into the air conditioner body 70 is provided at the rear portion of the floor frame 72 . The inside/outside air introduction section 368 is provided on the upper portion of the floor frame 72 . Specifically, it is provided above the rear lower wall 371 . Also, the inside/outside air introducing section 368 is arranged behind the driver's seat 13 (see FIG. 19). The internal/external air introduction unit 368 includes an internal/external air switching unit 370 that switches between an internal air introduction state and an external air introduction state, and a filter 372 that collects dust contained in the internal or external air introduced by the internal/external air switching unit 370 (see FIG. 18). ), and a filter housing portion 369 for housing the filter. The inside/outside air switching portion 370 and the filter housing portion 369 are arranged adjacent to each other in the body width direction K2. Specifically, the inside/outside air switching section 370 is provided substantially in the center in the body width direction K2, and the filter accommodating section 369 is located on the side of the inside/outside air switching section 370 and on the side corresponding to the air conditioner main body 70. is provided in To roughly explain the flow of air taken into the air conditioner body 70, inside air or outside air is sucked by the blower 70B inside the air conditioner body 70 and taken into the inside/outside air switching section 370. The air passes through the filter accommodating portion 369 and enters the introduction duct 365 from the introduction port 365 c to be taken into the air conditioner main body 70 .

As shown in FIGS. 8B and 16 , the inside/outside air introduction section 368 has an inside/outside air introduction box 373 forming part of the inside/outside air switching section 370 and the filter housing section 369 . The inside/outside air introduction box 373 includes a front wall 374, a rear wall 375, a top wall 376, a bottom wall 377, a first side wall 73L and a second side wall 73R.
The front wall 374 is positioned above the rear lower wall 371 and is connected to the upper end of the rear lower wall 371 via a connection wall 384 at the center side in the body width direction K2. A rear wall 375 is spaced rearwardly of the front wall 374 . The upper wall 376 extends from the upper end of the front wall 374 to the rear wall 375 . A bottom wall 377 is formed across the front wall 374 and the rear wall 375 . The first side wall 73L constitutes the left side of the inside/outside air introduction box 373. As shown in FIG. The second side wall 73R constitutes the right side surface of the inside/outside air introduction box 373. As shown in FIG. The inside/outside air introduction box 373 is not provided with a member that partitions the inside with respect to the body width direction K2. That is, the inside of the inside/outside air introduction box 373 communicates in the body width direction K2. Therefore, the inside of inside/outside air switching portion 370 and the inside of filter accommodating portion 369 are in communication.

The front wall 374 is formed in an inclined shape that shifts rearward as it goes upward. The front wall 374 has an opening 378 formed by a rectangular opening edge at the center in the body 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 internal air introduction port 381 has a lower introduction port 382A formed in the lower portion of the closing plate 380 and an upper introduction port 382B formed in the upper portion of the closing plate 380 . As shown in FIG. 17, the lower introduction port 382A and the upper introduction port 382B are composed of aggregates of many small holes.

As shown in FIG. 16, the front wall 374 has a notch 379 on its left side. The cutout 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 to open leftward 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 stepped in the body width direction K2. The bottom wall 377 has a first portion 377a at the center in the body width direction K2, a second portion 377b positioned to the left of the first portion 377a, and a third portion 377c positioned to the right of the first portion 377a. have. The first portion 377a is formed at a position higher than the second portion 377b. The third portion 377c is formed at a position higher than the first portion 377a. The first portion 377 a extends rearward from the lower edge of the opening 378 toward the rear wall 375 . The first portion 377 a 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 configured by forming a plurality of elongated holes 388 that are long in the longitudinal direction K1 of the fuselage side by side in the width direction K2 of the fuselage.

As shown in FIGS. 16 and 18, the second portion 377b extends toward the rear wall 375 from a position lower than the upper end of the wall portion 371c. The second portion 370b constitutes the bottom portion of the filter housing portion 369. As shown in FIG. An inspection opening 385 is formed in the left portion of the rear wall 375 at a portion forming the filter housing 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 includes a first vertical wall 377d that connects the first portion 377a and the second portion 377b, and a second vertical wall 377e that connects the first portion 377a and the third portion 377c. and
As shown in FIG. 19, behind the floor frame 72, a partition member 389 that forms the front surface of the engine room E1 is provided. The partition member 389 is made of a plurality of plate materials. In addition, you may form with a single board|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 introducing section 368 (inside/outside air switching section 370) from the housing portion of the fuel tank 390 in front of the partition member 389 inside the body frame 71 . A bottom opening 71B is formed in a bottom portion 71A of the body frame 71 . In addition, outside air is taken into the body frame 71 through the bottom opening 71B. Outside air is taken in from a portion inside the body frame 71 that is isolated from the motor 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 of taking in only inside air and a state of taking in both outside air and inside air. The configuration of the inside/outside air switching unit 370 is not limited to this, and may be configured to switch between a state in which only inside air is taken in and a state in which only outside air is taken in, for example.
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 whose position can be changed between an outside air introduction position P1 (see solid line) for taking in outside air and an inside air introduction position P2 (see two-dot chain line) for taking 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 section 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, inside air from the upper introduction port 382B and outside air from the outside air introduction port 387 are taken into the inside/outside air switching section 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, outside air is not taken in, and inside air is taken into the inside/outside air introduction box 373 through the lower introduction port 382A and the upper introduction port 382B.

As shown in FIG. 17 , the switching damper 391 has a plate member 392 , a first cushion member 393 , a second cushion member 394 and a contact 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 contact member 398 is fixed to the plate member 392, contacts the closing plate 380 at the outside air introduction position P1, and contacts 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 a 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 axis extending in the body width direction K2 and is fixed to the lower portion of the closing plate 380 . The lever base portion 395a is supported by the support boss 399 so as to be rotatable around the axis in the machine 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 395a by swinging the switching lever 395 up and down, and changes its position between the outside air introducing position P1 and the inside air introducing position P2. The switching lever 395 projects forward (on the driver's seat 13 side) from the closing plate 380 and can be operated by the operator from the driver's seat 13 side.

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

As shown in FIGS. 18 and 20, the filter housing portion 369 has a filter bracket 401 to which the filter 372 is attached. The filter housing portion 369 is configured with 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 FIG.

As shown in FIGS. 18 and 20, filter 372 is attached to the rear of filter bracket 401 . The filter 372 is a flat plate-shaped filter that collects dust by allowing air to flow in the thickness direction. The filter 372 is arranged vertically so that the filter surface 372a faces forward and backward. Specifically, the filter 372 is attached in a slanted manner that shifts rearward as it goes upward. The inside/outside air switching portion 370 communicates with the rear side of the filter 372 in the filter housing portion 369 . Specifically, a first flow path 402 through which air can flow is formed between the filter 372 and the rear wall 375 .

As shown in FIG. 18, the introduction duct 365 communicates with the front side of the filter 372 in the filter housing 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 below the filter 372. It is connected to the filter housing 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 pass through the second flow passage 403 to the introduction duct. 365 to be taken into the air conditioner main body 70 .
As described above, the working machine 1 of the present embodiment includes the machine body 2, the driver's seat 13 mounted on the machine body 2, and the boarding/alighting passageway (the boarding/alighting opening 309). It has an opening (opening portion) 313 that communicates the space on the floor 75 in front of the seat 13 with the outside of the aircraft body, 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 the vehicle through the opening 313 on the side opposite to the boarding/alighting passage (the boarding/alighting opening 309).
Further, the cabin 14 has a door 172 arranged at the entrance 309 and a door 314 provided at the opening 313 , and the blocking member 325 blocks the driver's getting on and off via 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 side opposite to the boarding/alighting passage (the boarding/alighting opening 309).

In addition, the front strut (second front strut 142R) arranged in front of the other side of the driver's seat 13, and the rear strut (second front strut 142R) arranged behind the front strut (second front strut 142R) and on the other side of the driver's seat 13 The door 314 is provided between the front support (second front support 142R) and the rear support (second rear support 305R) so that it can be opened and closed.
According to this configuration, by opening the door 314 , it is possible to take things in and out of the cabin from the side opposite to the entrance/exit 309 and clean the floor 75 of the cabin 14 .

In addition, a control stand 319 provided on the other side of the driver's seat 13 and a front strut (second front strut 142R) disposed in front of the other side of the driver's seat 13 are provided. It is provided over the base 319 and the front strut (second front strut 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 on the driver's seat 13 .

The control table 319 has the control lever 16 at the front, and the blocking member 325 is arranged at a position overlapping the control lever 16 along the line of sight of the operator seated on 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 interfering with the operator's side vision.

The driver's seat 13 has a seat portion 13A and a backrest portion 13B. 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.

In addition, a mounting piece 326 fixed to the front strut (second front strut 142R) is provided, and the control platform 319 has a support bracket 321 that supports the control lever 16 and a console box 319A that covers 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 inside the console box 319A.

According to this configuration, the blocking member 325 can also be removed. Moreover, 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.
Moreover, the door 314 has light transmittance.
According to this configuration, the operator can visually recognize the side through the door 314, and the operator's side visibility can be improved.

Further, the work machine 1 of the present embodiment includes a machine body 2, a traveling device 17 that supports the machine body 2 so as to be able to travel, a hydraulic drive device 353 that hydraulically drives the traveling device 17, and a mount member 303 mounted on the machine body 2. the floor frame 72 supported by the support, the pedals (brake pedals 111L, 111R) for performing the braking operation of the travel device 17, and the pedals (brake pedals 111L, 111R) supplied to the hydraulic drive device 353 according to the operation of the pedals (brake pedals 111L, 111R). An inching valve 338 for changing the flow rate of hydraulic oil and a cable 336 for interlocking the pedals (brake pedals 111L, 111R) and the inching valve 338 are provided. attached to the

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

The floor frame 72 also 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 can be arranged on the lower side of the driver's seat 13 using the space.
The floor frame 72 also has an inspection opening 77a through which the inching valve 338 is located below and accessible through the inspection opening 77a.

According to this configuration, the inching valve 338 can be easily assembled and inspected through the inspection opening 77a.
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 closing the inspection opening 77a. The inching valve 338 is arranged below the open/close cover 78 .

According to this configuration, the inching valve 338 can be easily assembled and inspected by removing the opening/closing cover 78 .
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. Rotation of the lever 338B about the vertical axis changes the flow rate of the hydraulic fluid supplied to the hydraulic drive device.

With this configuration, it is possible to suppress movement of the valve lever 338B due to vertical vibrations, and to prevent speed reduction due to movement of the valve lever 338B due to vertical vibrations.
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 connected to the discharge circuit 351 of the hydraulic pump 349. is provided on the rear surface 338a, a second connecting portion 347 connected to the hydraulic oil tank 344 is provided on the side surface 338b on the side of the hydraulic oil tank 344, and an operation shaft 345 to which the valve lever 338B is connected is provided on the upper surface 338c side.

With this configuration, the connection between the valve body 338A and the hydraulic fluid tank 344 can be simplified, and the hydraulic hose connecting the inching valve 338 and the hydraulic fluid tank 344 can be shortened. Also, by disposing 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 joint structure between the valve lever 338B and the operating shaft 345 can also be simplified.

Also, a frame member (column frame 88) erected in front 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 which one end side of a cable 336 is attached. a mounting bracket 340 fixed to the installation portion (bottom wall 74); a valve bracket 339 attached to the mounting bracket 340 and to which an inching valve 338 is attached; A second cable stay 342 to which the other end side of 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 to sub-assemble and then attached to the floor frame 72, so that the inching valve 338 can be easily assembled.
Further, the work machine 1 of the present embodiment includes a machine body 2, a cabin 14 mounted on the machine body 2, an air conditioner main body 70 for air-conditioning the interior of the cabin 14, and the air conditioner main body 70 containing air inside the cabin 14 and air outside the cabin 14. and an inside/outside air introduction portion 368 for introducing outside air, the inside/outside air introduction portion 368 having an inside air introduction port 381 for taking in inside air, an outside air introduction port 387 for taking in outside air, and an outside air introduction port 387 for introducing outside air. an inside/outside air switching unit 370 including a switching damper 391 that can be changed between an introduction position P1 and an inside air introduction position P2 that closes the outside air introduction port 387; and 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 and outside air flowing from the inside/outside air switching portion 370 to the air conditioner main body 70 .

According to this configuration, an inside/outside air switching unit 370 for switching between a state in which outside air is introduced and a state in which outside air is not introduced, and a filter 372 for removing dust from inside and outside air flowing from the inside/outside air switching unit 370 to the air conditioner body 70 are accommodated. The filter 372 can be shared by arranging the filter accommodating portion 369 adjacently. 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 section 370 can be formed compactly.

In addition, a motor 352 and a partition member 389 forming a front surface of a motor room E1 that houses the motor 352 are provided.
According to this configuration, the intake of outside air can be less affected by the exhaust gas discharged from the prime mover 352 .

In addition, the driver's seat 13 mounted on the fuselage 2 is provided, and the inside/outside air introduction part 368 is arranged behind the driver's seat 13, and has an inclined front wall 374 that moves upward as it goes rearward, and a front 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 in the bottom wall 377 to The air switching unit 370 can be operated from the driver's seat 13 side, and is pivotally supported by the support boss 399 arranged below the inside air introduction port 381 and in front of the outside air introduction port 387, and the switching damper 391. has a switching lever 395 to which is fixed.

According to this configuration, the positional relationship between the inside air introduction port 381 and the outside air introduction port 387 can be made closer, and the inside/outside air switching section 370 can be formed compactly.
Further, a fuel tank 390 is arranged below the inside/outside air switching portion 370 , and the bottom wall 377 includes a first portion 377 a that forms the bottom portion of the inside/outside air switching portion 370 and a second portion 377 a that forms the bottom portion of the filter accommodating portion 369 . The first portion 377a is formed at a position higher than the second portion 377b.

With this configuration, the height of the fuel tank 390 can be increased, and the capacity of the fuel tank 390 can be increased.
An introduction duct 365 is provided above the air conditioner body 70 and communicates with the air conditioner body 70. The inside/outside air switching section 370 and the filter housing section 369 are arranged side by side in the body width direction K2. is arranged vertically with the filter surface 372a facing forward and backward, the internal/external air switching portion 370 communicates with the rear side of the filter 372 in the filter housing portion 369, and the introduction duct 365 is connected on the front side and the lower side of the filter 372. It has an introduction port 365 c connected to the filter housing portion 369 .

With 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 embodiment disclosed this time is illustrative in all respects and is not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

2 Airframe 13 Driver's seat 13A Seat 13B Backrest 16 Control lever 142R Front strut (second front strut)
172 doors (boarding/alighting doors)
305R rear strut (second rear strut)
309 Boarding Passage (Boarding Gate)
314 door 319 control table 319A console box 321 support bracket 325 blocking member 326 attachment piece

Claims (8)

Airframe and
a driver's seat mounted on the aircraft;
an opening provided on the other side opposite to the boarding and alighting passage provided on one side of the driver's seat and communicating between the space on the floor in front of the driver's seat and the exterior of the fuselage;
a blocking member formed of a rod-shaped member and provided at a position that interferes with getting on and off through the opening in order to block the driver from getting on and off the vehicle through the opening;
A work machine equipped with A cabin having a door arranged in the aisle for getting on and off and a door provided in the opening,
The work machine according to claim 1, wherein the blocking member blocks a driver's getting on and off through the door. a front strut arranged in front of the other side of the driver's seat;
a rear strut arranged behind the front strut and on the other side of the driver's seat,
The working machine according to claim 2, wherein the door is provided between the front support and the rear support so that it can be opened and closed. Airframe and
a driver's seat mounted on the aircraft;
an opening provided on the other side opposite to the boarding and alighting passage provided on one side of the driver's seat and communicating between the space on the floor in front of the driver's seat and the exterior of the fuselage;
a blocking member that blocks a driver from getting on and off from the opening;
a control stand provided on the other side of the driver's seat;
A front strut arranged in front of the other side of the driver's seat,
The work machine, wherein the blocking member is provided over the control platform and the front strut. The control platform has a control lever at the front,
5. The working machine according to claim 4, wherein the blocking member is arranged at a position overlapping the control lever along a line-of-sight direction of an operator seated in the driver's seat. Airframe and
a driver's seat mounted on the aircraft;
an opening provided on the other side opposite to the boarding and alighting passage provided on one side of the driver's seat and communicating between the space on the floor in front of the driver's seat and the exterior of the fuselage;
a blocking member that blocks a driver from getting on and off from the opening;
a control stand provided on the other side of the driver's seat and having a control lever at the front;
with
The driver's seat has a seat portion and a backrest portion,
The blocking member is formed of a rod-shaped member, extends in the longitudinal direction of the machine body, and is arranged below the upper end of the control lever and above the bottom surface of the seat. A mounting piece fixed to the front strut,
The control platform has a support bracket that supports the control lever and a console box that covers the support bracket,
6. The working machine according to claim 5 , wherein the blocking member has a front portion attached to the mounting piece and a rear portion attached to the support bracket inside the console box. The work machine according to claim 2 or 3 , wherein the door has light permeability.

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