JP6995707B2 - Working machine - Google Patents

Description

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

Conventionally, a working machine disclosed in Patent Document 1 is known.
The working machine disclosed in Patent Document 1 has a steering column that supports steering. A brake shaft extending in the width direction of the machine body is rotatably supported around the axis of the steering column. On the side of the steering column, a brake pedal is provided so as to be rotatable integrally with the brake shaft.

Japanese Unexamined Patent Publication No. 8-40223

In the working machine disclosed in Patent Document 1, the return spring for returning to the position before operating the brake pedal is formed by a tension coil spring. Therefore, it is difficult to compactly configure the support structure for supporting the brake pedal.
Therefore, in view of the above problems, it is an object of the present invention to compactly configure a support structure for supporting the brake pedal.

The working machine according to one aspect of the present invention includes a steering column that supports steering, a brake shaft that is rotatably supported around the axis extending in the width direction of the steering column, and lateral sides of the steering column. It has a brake pedal that is arranged and rotatably attached to the brake shaft, a return spring that returns to the position before operating the brake pedal, and an arm boss that is integrally rotatably fitted to the outer periphery of the brake shaft. A brake arm that operates the master cylinder by operating the brake pedal, and a bearing that is fixed to the steering column and the brake shaft is inserted and supports the arm boss on the inner peripheral side to support the brake shaft. A cylinder and the return spring are formed by a torsion coil spring, are arranged inside the steering column, and are provided so as to surround the periphery of the bearing cylinder .

According to the above configuration, the support structure for supporting the brake pedal can be compactly configured by forming the return spring that returns the brake pedal to the position before the operation by the torsion coil spring.

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 front machine body and a working apparatus. It is an exploded perspective view of the mounting part of a work tool. It is a top view of the front part of a working machine. It is the figure which looked at the quick coupler from the bottom. It is a side sectional view of the connecting part of a lift arm. It is a perspective view which looked at the left inner side of a quick coupler from the back side. It is a perspective view which looked at the right inside of a quick coupler from the back side. It is a perspective view of a rear fuselage. It is a perspective view which looked at the floor frame from the diagonally upper left. It is a perspective view which looked at the floor frame from the back side. It is a perspective view of the front part of a cabin room. It is a top view of the front part of a cabin room. It is a rear view of the front part of a cabin room. It is a rear perspective view of the front part of a console. It is a front view of the brake pedal device etc. supported by a column frame. It is a figure of the brake pedal device, etc. supported by a column frame. It is a front view of the support part of a brake shaft. It is a side view of the mounting part of a brake arm. It is a front view in the state which the opening of the front panel is opened. It is a front view in the state which the opening of the front panel is opened. It is a side sectional view of the arrangement part of the duct structure. It is a perspective view which looked at the arrangement part of the duct structure from above. It is a side sectional view of the 1st duct and the 2nd duct. It is a perspective view of the connection part of the 1st member and the 2nd member. It is a perspective view of the arrangement part of the 2nd duct, the 1st side duct and the 2nd side duct. It is a perspective view which looked at the front part of a cabin room from the back side. It is a perspective view which shows the connection structure of the 2nd duct, the 1st side duct and the 2nd side duct.

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 working machine 1 according to the present embodiment. FIG. 2 is a schematic plan view of the working machine 1. In this embodiment, a 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 wheel 4L is provided on the left side of the rear fuselage 2B, and the rear wheel 4R is provided on the right side of the rear fuselage 2B. The rear aircraft 2B is provided 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 aircraft 2 in the aircraft 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. 1, the direction of the arrow B2 of FIG. 2) will be described as the right side.
Further, the horizontal direction, which is a direction orthogonal to the front-rear direction K1, will be described as the machine width direction K2 (see FIG. 2). The direction from the central portion to the right portion or the left portion in the width direction of the machine body 2 will be described as the outside of the machine body. In other words, the outside of the machine is the direction K2 in the width direction of the machine and away from the center in the width direction of the body 2. The direction opposite to the outside of the aircraft will be described as the inside of the aircraft. In other words, the inside of the machine is the direction K2 in the width direction of the machine and is closer to the center in the width direction of the body 2.

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 in the front-rear direction K1, and the airframe connecting member 5 is provided with the rear end side of the front airframe 2A. It is swingably connected in the width direction K2 of the machine body around the center of the vertical axis (the center of the axis extending in the vertical direction).
A steering cylinder 6 composed of a hydraulic cylinder is provided over the machine body connecting member 5 and the front machine body 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 working 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. 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 in the cabin 14 (hereinafter referred to as the cabin interior). The steering 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.

A motor is mounted on the rear fuselage 2B. The prime mover is a diesel engine. The prime mover may be a gasoline engine, an LPG engine or an electric motor, or may be a hybrid type having an engine and an electric motor. Further, the driver's seat protection device may be a canopy.
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 airframe 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 machine 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 machine width direction K2 on the upper part of the second support frame 10R whose base end side is erected on the right side of the front machine 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 machine width direction K2 and 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. Further, when confirming the state (connected state or disengaged state) of the first pin 40L and the second pin 40R, which will be described later, this can be done without moving the body too much. That is, it is possible to improve the ease of checking the states of the first pin 40L and the second pin 40R. In addition, the front wheels 3L and the front wheels 3R can be easily confirmed. This makes it easy to work while looking at the front wheels 3L and the front wheels 3R. 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 a pallet fork is attached as a work tool 9, it is possible to work while looking at the toes of the pallet fork.

As shown in FIG. 5, 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. 7, the connecting pipe 26 is formed in an elliptical shape having a cross-sectional shape long in the longitudinal direction of the lift arm 8. In the present embodiment, the cross-sectional shape of the connecting pipe 26 is an oval shape (a shape in which a part of a circle is cut out in a flat shape) in which both sides of two flat surfaces are connected by an arc. By making the connecting pipe 26 oval, it is possible to secure sufficient strength and improve visibility (forward visibility) when the operator seated in the driver's seat 13 looks forward.

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 the middle portion of the second arm 8R in the longitudinal direction and the middle portion of the second support frame 10R in the vertical direction. 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 FIG. 4, 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 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 attached. The lower 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 an intermediate 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. The rear part of the interlocking link 31 is pivotally supported at the lower part of the swing link 28. The front part of the interlocking link 31 is pivotally supported (engaged) with the upper part 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.

As shown in FIGS. 3 and 4, on the back surface of the work tool (bucket) 9, a first fixing plate 34L and a second fixing plate 34R provided at intervals in the machine width direction K2 are provided. The first fixing plate 34L and the second fixing plate 34R extend in the vertical direction. The first fixing plate 34L and the second fixing plate 34R have a hook portion 34a at the upper portion and an insertion hole 34b at the lower portion.
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 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. 5, a control valve V1 is mounted on the front fuselage 2A. The control valve V1 is a hydraulic device configured by integrating control valves for controlling hydraulic actuators such as hydraulic cylinders and hydraulic motors mounted on the work machine 1. The control valves constituting the control valve V1 are, for example, a lift control valve that controls the lift cylinder 11, a work tool control valve that controls the work tool cylinder 12, and a preliminary control valve 38 that controls a hydraulic actuator mounted on the work tool 9. Is. The preliminary control valve 38 is, specifically, a control valve that controls the hydraulic actuator when the work tool 9 equipped with the hydraulic actuator is mounted.

As shown in FIGS. 5 and 6, the working device 7 has a quick coupler 32 that detachably attaches the working tool 9 to the lift arm 8. The quick coupler 32 has a first engaging pin (first engaging portion) 39L, a second engaging pin (second engaging portion) 39R, a first pin (connecting pin) 40L, and a second pin (connecting pin) 40R. , Has a coupler cylinder 42, a first plate 41L and a second plate 41R.

The first engaging pin 39L is provided on the left side of the front portion of the interlocking link 31, and the second engaging pin 39R is provided on the right side of the front portion of the interlocking link 31. Specifically, a support cylinder 43 extending in the machine width direction K2 is provided at the front portion of the interlocking link 31, and a rod member 35 is inserted and fixed to the support cylinder 43. A first engaging pin 39L is integrally formed at the left end of the rod member 35. The first engaging pin 39L is formed to have a smaller diameter than the rod member 35, and can be engaged with the hook portion 34a of the first fixing plate 34L from below. Further, the second engaging pin 39R is integrally formed at the right end of the rod member 35. The second engaging pin 39R is formed to have a smaller diameter than the rod member 35, and can be engaged with the hook portion 34a of the second fixing plate 34R from below.

The first pin 40L is provided on a bearing boss 19L provided on the front portion (tip side) of the first arm 8L so as to be movable in the machine width direction K2. The first pin 40L can be inserted into the insertion hole 34b of the first fixing plate 34L. The work tool 9 and the first arm 8L are connected by inserting the first pin 40L into the insertion hole 34b.
As shown in FIG. 6, the second pin 40R is provided on the bearing boss 19R provided on the front portion (tip side) of the second arm 8R so as to be movable in the machine width direction K2. The second pin 40R can be inserted into the insertion hole 34b of the second fixing plate 34R. The work tool 9 and the second arm 8R are connected by inserting the second pin 40R into the insertion hole 34b.

The coupler cylinder 42 is a device for driving the first pin 40L and the second pin 40R. The coupler cylinder 42 has a cylinder tube 42A. The cylinder tube 42A is arranged so as to extend in the machine width direction K2 between the front portions of the first arm 8L and the second arm 8R (between the bearing boss 19L and the bearing boss 19R).
A first pin 40L is provided on one end side (left end side) of the cylinder tube 42A so as to be movable in the body width direction K2 (movable to move in and out). Specifically, the first pin 40L is provided so as to be movable in a direction of protruding from the cylinder tube 42A (left side) and a direction of retreating into the cylinder tube 42A (right side). On the left side of the cylinder tube 42A, a first piston 42L to which the first pin 40L is connected is provided. The first pin 40L is driven by the first piston 42L. Therefore, the first pin 40L constitutes the rod of the coupler cylinder 42. The rod of the coupler cylinder 42 and the first pin 40L may be separate bodies.

As shown in FIG. 6, a second pin 40R is provided on the other end side (right end side) of the cylinder tube 42A so as to be movable (movable to move in and out) in the body width direction K2. Specifically, the second pin 40R is provided so as to be movable in a direction of protruding from the cylinder tube 42A (right side) and a direction of retracting into the cylinder tube 42A (left side). A second piston 42R to which the second pin 40R is connected is provided on the right side of the cylinder tube 42A. The second pin 40R is driven by the second piston 42R. Therefore, the second pin 40R constitutes the rod of the coupler cylinder 42. The rod of the coupler cylinder 42 and the second pin 40R may be separate bodies.

As described above, the coupler cylinder 42 is formed of both rod type hydraulic cylinders in which a pair of rods can move back and forth from the cylinder tube 42A at the same time.
As shown in FIG. 6, the first plate 41L connects the first engagement pin 39L side and the first pin 40L side. Specifically, the upper portion of the first plate 41L is attached to the left portion of the rod member 35. The lower portion of the first plate 41L is attached to the left portion of the cylinder tube 42A. The first plate 41L connects the first engaging pin 39L and the first pin 40L via the rod member 35 and the cylinder tube 42A.

The second plate 41R connects the second engagement pin 39R side and the second pin 40R side. Specifically, the upper portion of the second plate 41R is attached to the right portion of the rod member 35. The lower portion of the second plate 41R is attached to the right portion of the cylinder tube 42A. The second plate 41R connects the second engaging pin 39R and the second pin 40R via the rod member 35 and the cylinder tube 42A.

To mount the work tool 9 on the quick coupler 32, first, the first engaging pin 39L is engaged with the hook portion 34a of the first fixing plate 34L from below, and the second engaging pin 39R is engaged with the second fixing plate 34R. It engages with the hook portion 34a of the above from below. When the lift arm 8 is moved upward from this state, the work tool 9 is lifted, and the lower side of the work tool 9 moves backward around the first engagement pin 39L and the second engagement pin 39R. The work tool 9 is positioned by abutting on the stopper member 48 provided on the lift arm 8. When the first pin 40L and the second pin 40R are moved in the protruding direction in this state, the first pin 40L is inserted into the insertion hole 34b of the first fixing plate 34L and the second pin 40R is inserted into the second fixing plate 34R. Insert through the hole 34b. As a result, the work tool 9 is attached to the quick coupler 32 (lift arm 8).

As shown in FIG. 8, the first connecting member 49L is attached to the inside of the lower part (toward the inside of the machine) of the first plate 41L. The first connecting member 49L has a first input member 50L and a first output member 51L. A first hydraulic line 52L is connected to the first connecting member 49L. As shown in FIG. 5, the first hydraulic line 52L is arranged along the first arm 8L from the preliminary control valve 38 (control valve V1) to the front portion of the first arm 8L. The first hydraulic line 52L has a first pipe 53L, a second pipe 54L, and a third pipe 55L. The first pipe 53L is attached to the inside of the first arm 8L (on the side inside the machine). The first pipe 53L is formed of a steel pipe and is arranged by passing under the connecting pipe 26 (see FIG. 7). As a result, the visibility in front of the operator seated in the driver's seat 13 can be improved. The second pipe 54L connects the preliminary control valve 38 and the first pipe 53L. As shown in FIG. 6, the third pipe 55L connects the first pipe 53L and the first input member 50L. The second pipe 54L and the third pipe 55L are composed of a hydraulic hose. The first hydraulic pipeline 52L includes a member necessary for connecting a pipe such as a hydraulic joint.

As shown in FIG. 8, the first output member 51L has a first take-out portion 56L capable of taking out hydraulic oil. The first take-out portion 56L is connected to the hydraulic actuator mounted on the work tool 9 via a hydraulic hose or the like. Further, the first output member 51L has a first output unit 57L. The first output unit 57L can output hydraulic oil. As shown in FIG. 6, the first output unit 57L is connected to the head side of the first piston 42L and the second piston 42R in the coupler cylinder 42 via a connecting member 60. The head side is the side opposite to the side to which the first pin 40L and the second pin 40R are connected. In the case of this embodiment, it is the center side of the cylinder tube 42A (between the first pin 40L and the second pin 40R). Therefore, the hydraulic oil from the first hydraulic line 52L is supplied from the first output unit 57L to the head side of the coupler cylinder 42 via the connecting member 60, so that the first piston 42L and the second piston 42R become the airframe. The first pin 40L and the second pin 40R can be moved outward to be inserted into the insertion hole 34b. When the first pin 40L and the second pin 40R are retracted, the hydraulic oil is discharged from between the first piston 42L and the second piston 42R in the cylinder tube 42A via the connecting member 60 and the first output unit 57L. It has become like.

As shown in FIG. 9, the second connecting member 49R is attached to the inside of the lower portion (toward the inside of the machine) of the second plate 41R. The second connecting member 49R has a second input member 50R and a second output member 51R. A second hydraulic line 52R is connected to the second connecting member 49R. As shown in FIG. 5, the second hydraulic line 52R is arranged along the second arm 8R from the preliminary control valve 38 (control valve V1) to the front portion of the second arm 8R. The second hydraulic line 52R has a fourth pipe 53R, a fifth pipe 54R, and a sixth pipe 55R. The fourth pipe 53R is attached to the inside of the second arm 8R (on the side of the machine body). The fourth pipe 53R is formed of a steel pipe and is arranged by passing under the connecting pipe 26 (see FIG. 7). This makes it possible to improve the visibility in front of the operator seated in the driver's seat 13. The fifth pipe 54R connects the preliminary control valve 38 and the fourth pipe 53R. As shown in FIG. 6, the sixth pipe 55R connects the fourth pipe 53R and the second input member 50R. The fifth pipe 54R and the sixth pipe 55R are composed of hydraulic hoses. The second hydraulic pipeline 52R also includes members necessary for connecting pipes such as hydraulic joints.

The second output member 51R has a second take-out portion 56R capable of taking out hydraulic oil. The second take-out portion 56R is connected to the hydraulic actuator mounted on the work tool 9 via a hydraulic hose or the like. Further, the second output member 51R has a second output unit 57R. The second output unit 57R can output hydraulic oil to the lock release valve 61.
The unlock valve 61 is attached to the inside of the lower part of the second plate 41R. The lock release valve 61 is provided in the vicinity of the second output member 51R. The lock release valve 61 is composed of a solenoid valve (solenoid valve), and has a main body valve 61A for operating the coupler cylinder 42 (supplying and discharging hydraulic oil) and a solenoid unit 61B for controlling the main body valve 61A. ..

The main body valve 61A is connected to the second output unit 57R of the second output member 51R via the connecting member 62. Further, the main body valve 61A is connected to the rod side of the first piston 42L and the second piston 42R in the coupler cylinder 42 via a connecting member 63. The rod side is the side to which the first pin 40L and the second pin 40R are connected. In this embodiment, it is one end side and the other end side of the cylinder tube 42A. When the hydraulic oil from the second hydraulic line 52R is supplied from the main body valve 61A to the rod side of the coupler cylinder 42 via the connecting member 63, the first piston 42L and the second piston 42R move toward the inside of the machine. The first pin 40L and the second pin 40R are removed from the insertion hole 34b. As a result, the connection between the lift arm 8 and the work tool 9 by the first pin 40L and the second pin 40R is released. When the first pin 40L and the second pin 40R are projected, the hydraulic oil is drained from the rod side of the cylinder tube 42A via the connecting member 63, the main body valve 61A, and the second output unit 57R. The lock release valve 61 is operated, for example, by a switch provided on the grip of the control lever 16.

The solenoid portion 61B is covered with a cover member 64. The cover member 64 is attached to the second plate 41R.
The lock release valve 61 may be attached to the second plate 41R.
As shown in FIG. 10, the rear fuselage 2B has a fuselage frame 71 and a floor frame 72 mounted on the fuselage frame 71. The airframe frame 71 is movably supported by the rear wheels 4L and the rear wheels 4R. A machine body connecting member 5 is attached to the front part of the machine body frame 71.

As shown in FIGS. 11 and 12, the floor frame 72 is mounted on the airframe 71 via a mount member having an elastic material, and is vibration-proof and supported by the airframe 71. The floor frame 72 has a left side wall 73L and a right side wall 73R. A bottom wall (installation portion) 74 is provided between the lower portion of the side wall 73L and the 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. Specifically, a gap is provided between the front end side of the bottom wall 74 and the opening / closing cover 78, which will be described later, through which a duct member for passing conditioned air passes.

The floor portion 75 has a floor main body 77 having an inspection opening 77a, and an opening / closing cover 78 for closing the inspection opening 77a. The floor body 77 has a first site 79, a second site 80, and a third site 81.
The first portion 79 constitutes the left portion of the floor body 77. The rear portion 79a of the first portion 79 is formed to have a narrower width in the body width direction K2 than the front portion 79b. Specifically, the rear portion 79a is located on the outer side (left side) of the fuselage from the side wall 73L, and the front portion 79b is a portion extending forward from the rear portion 79a and a portion inside the aircraft from the portion to the rear portion 79a. It has a part that extends (to the right).

The second portion 80 constitutes the right portion of the floor body 77. The rear portion 80a of the second portion 80 is formed to have a narrower width 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 side wall 73R, and the front portion 80b is a portion extending forward from the rear portion 80a and a portion inside the aircraft from the portion to the rear portion 80a. It has a part that extends (to the left).

The third portion 81 is located in the central portion of the body 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.
There is an opening between the rear portion 79a of the first site 79 and the rear portion 80a of the second site 80. This opening is the inspection opening 77a. Equipment and the like deployed in the machine frame 71 can be inspected through the inspection opening 77a.

As shown in FIG. 12, the third portion 81 is formed in a recess that is recessed downward. Specifically, the third site 81 has a side wall portion 81a extending downward from the front right end of the first site 79, a side wall portion 81b extending downward from the front left end of the second site 80, and a side wall portion 81a. It also has a lower wall portion 81c that connects the lower ends of the side wall portions 81b to each other.
As shown in FIGS. 13 and 14, 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 interior in the aircraft width direction K2.

As shown in FIG. 13, the steering column 87 has a column frame (frame member) 88 erected on the front portion of the floor frame 72, and a column cover 89 covering the column frame 88.
As shown in FIGS. 11 and 12, 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 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 machine 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. Specifically, the first side wall 88L is fixed to the right end side of the front portion 79b of the first portion 79 and to the front side of the third portion 81. The second side wall 88R constitutes the right portion of the column frame 88 and is erected on the floor portion 75. Specifically, it is fixed to the left end side of the front portion 80b of the second site 80 and to the front side of the third site 81.

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 to each other. The first connecting member 83 has a mounting wall portion 83A at the center of the machine body width direction K2. The first connecting member 83 has one side wall portion 83L located on the left side of the mounting wall portion 83A and another side wall portion 83R located on the right side. The one side wall portion 83L and the other side wall portion 83R are located in front of the mounting wall portion 83A. The mounting wall portion 83A, the one side wall portion 83L, and the other side wall portion 83R are connected to each other. The first connecting member 83 projects forward from the left end of the one side wall portion 83L and is fixed to the first side wall 88L, and the first connecting member 83 projects forward from the right end of the other side wall portion 83R and is fixed to the second side wall 88R. It has a fixed wall 83C.

The second connecting member 84 connects the lower portions of the first side wall 88L and the second side wall 88R to each other. Specifically, the second connecting member 84 has a rear wall 84A that rises from the front of the lower wall portion 81c of the third portion 81, and an inclined upper wall 84B that moves upward from the upper end of the rear wall 84A toward the front. And have.
As shown in FIG. 15, the column cover 89 (steering column 87) has a switch panel 99 arranged below the steering 15 on the upper surface side. The switch panels 99 are arranged on both sides of the steering post 91 supporting the steering 15 in the body width direction K2, and a plurality of switches (first) provided in an inclined manner so as to move forward toward the front in a plan view. It has a first switch group 101 including switches 101A to fourth switch 101D).

As shown in FIG. 13, the column cover 89 has a first cover member 96, a second cover member 97, and a third cover member 98. The first cover member 96 constitutes the upper portion of the column cover 89. A monitor 100 is provided on the back side of the first cover member 96. The front surface side of the first cover member 96 is open.
The second cover member 97 is provided on the lower side of the first cover member 96. The first cover member 96 and the second cover member 97 are located above the column frame 88 and project to the left and right of the column frame 88. The front side of the second cover member 97 is also open.

As shown in FIG. 15, the second cover member 97 has a first panel holding portion 102L extending rearward from the first cover member 96 on the left side. Further, the second portion 97b has a second panel holding portion 102R extending rearward from the first cover member 96 on the right portion. The steering post 91 passes between the first panel holding portion 102L and the second panel holding portion 102R.

The switch panel 99 includes a first switch panel 99L provided on the first panel holding portion 102L and a second switch panel 99R provided on the second panel holding portion 102R.
As shown in FIG. 13, the third cover member 98 has a first portion 98a, a second portion 98b, and a third portion 98c. The first portion 98a covers the back surface side of the column frame 88. The second portion 98b covers the lower surface side of the second cover member 97. Specifically, the second portion 98b covers the lower surface side of the left portion, the lower surface side of the right portion, and the lower surface side of the front portion of the second cover member 97. The third portion 98c is located between the first panel holding portion 102L and the second panel holding portion 102R, and covers the space between the panel holding portions 102L and 102R. A boot member 103 that covers the steering post 91 is provided at the third portion 98c.

The front side of the steering column 87 is open. As shown in FIGS. 13 and 14, the steering column 87 is arranged close to the front panel 141 of the cabin 14, and the front panel 141 covers the front side of the steering column 87.
As shown in FIGS. 13 and 15, the front panel 141 includes a first front strut 142L provided on the left side of the front part of the cabin 14 and a second front strut 142R provided on the right side of the front part of the cabin 14. It is provided between. The front panel 141 has a front window 146 that is transparent so that the front can be seen. The front window 146 constitutes an intermediate portion from the upper part of the front panel 141. The front window 146 has a main portion 146A, a first lower portion 146L, and a second lower portion 146R. The main portion 146A is provided above the steering column 87 from the first front strut 142L to the second front strut 142R. The first lower portion 146L extends downward from the left side of the main portion 146A and is located on one side of the upper part of the steering column 87. The second lower portion 146R extends downward from the right side of the main portion 146A and is located on the other side of the upper part of the steering column 87. An opaque cover panel portion 147 is formed between the first lower portion 146L and the second lower portion 146R. The front surface side of the upper part of the steering column 87 is covered by the cover panel portion 147.

The state of the front wheels 3L and the first pin 40L can be visually recognized from the cabin room through the first lower portion 146L. In addition, the states of the front wheels 3R and the second pin 40R can be visually recognized from the cabin room through the second lower portion 146R.
As shown in FIG. 15, the first switch group 101 includes the first switch 101A and the second switch 101B arranged side by side on the left side (one side) of the steering post 91, and the right side (one side) of the steering post 91. It has a third switch 101C and a fourth switch 101D arranged side by side on the other side). The first switch 101A and the second switch 101B have an inclined shape that shifts to the left as they move forward. The third switch 101C and the fourth switch 101D have an inclined shape that shifts to the right as they move forward.

The first switch 101A and the second switch 101B are provided on the first switch panel 99L, and the third switch 101C and the fourth switch 101D are provided on the second switch panel 99R. Further, the first switch 101A to the fourth switch 101D are seesaw switches in which one end side and the other end side in the inclination direction are pressed.
The first switch 101A is a release switch that releases the lock of the work tool 9. Specifically, the first switch 101A is a double action switch with a guard, and when the knob 101a is operated (for example, when it is pushed down), the front part of the first switch 101A can be pressed, and when the front part is pressed, the front part can be pressed. The lock release valve 61 can be operated. Therefore, the lock release valve 61 cannot be operated unless the first switch 101A is operated (the operation of the lock release valve 61 becomes invalid). When the first switch 101A is operated, the lock release valve 61 can be operated (the operation of the lock release valve 61 becomes effective). That is, the connection between the lift arm 8 and the work tool 9 can be released by the operation intended by the operator.

The second switch 101B is a regeneration switch that operates an exhaust gas purifying device that purifies the exhaust gas. The exhaust gas purification device is, for example, a DPF (Diesel particulate filter).
The third switch 101C is a light switch that turns on or off the work lights 33L and 33R.

The fourth switch 101D is a parking switch that regulates movement during parking. Specifically, it is a switch for operating or releasing the parking brake device that regulates the movement of the work machine 1 during parking.
As shown in FIG. 13, a console 104 is provided on the side of the driver's seat 13 in the cabin room. The console 104 is attached to the floor frame 72. A control lever 16 is provided at the front of the console 104.

As shown in FIGS. 14 and 16, the console 104 has a switch installation portion 105 provided in front of and below the control lever 16. The switch installation unit 105 is provided with a second switch group 106 including a plurality of switches (fifth switch 106A to seventh switch 106C) arranged side by side in the body width direction K2. The fifth switch 106A to the seventh switch 106C are seesaw switches that are swung back and forth. Further, the second switch group 106 is a work system operation switch.

The fifth switch 106A is a hold switch that keeps hydraulic oil flowing in a certain direction with respect to the hydraulic attachment mounted on the work machine 1, and by operating the switch 106A, the operation of the hydraulic actuator mounted on the hydraulic attachment is continuously maintained. Let me. The sixth switch 106 is a float switch that floats the lift arm 8 that supports the hydraulic attachment (working tool 9) so as to be able to swing up and down. The seventh switch 106 is an unload switch that regulates the operation of the lift arm 8 and the hydraulic attachment, and by operating the switch 106, the working device 7 is switched between an operable state and an inoperable state.

As shown in FIGS. 17 and 18, a steering valve 90 for controlling the steering cylinder 6 is attached to the lower surface side of the upper wall 84B. A steering post 91 that supports the steering 15 is attached to the upper wall 84B and the mounting wall portion 83A. The steering post 91 is provided in an inclined shape so as to pass from the upper wall 84B to the back surface side of the mounting wall portion 83A and to move backward as it goes upward. A steering shaft that transmits a steering operation to the steering valve 90 is inserted into the steering post 91. The steering 15 is attached to the upper part of the steering shaft.

As shown in FIG. 13, the side panel 171 constituting the right side surface of the cabin 14 includes a transparent portion 171a in which the outside can be visually recognized from between the second front support column 142R of the cabin 14 and the console 104. Therefore, the outside can be seen from the cabin interior through the side panel 171 on the right side of the cabin 14, and the visibility can be improved. Further, the left side panel of the cabin 14 is an entry / exit door 172 for getting on / off the cabin 14 (see FIG. 1). In this embodiment, the right side panel 171 is also a door that can be opened and closed. Therefore, the boarding / alighting passage may be set between the second front support column 142R and the console 104 so that the passenger can get on / off from the right side of the cabin 14. Further, the door on the right side (side panel 171) has a transparent door window 171A that allows the outside to be visually recognized. The door window 171A includes the permeable portion 171a.

As shown in FIG. 17, a first brake pedal (brake pedal) 111L is arranged on the left side of the column frame 88. A second brake pedal (another brake pedal) 111R is arranged on the right side of the column frame 88. A brake shaft 112 having an axial center extending in the width direction K2 of the machine body 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 around 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. A pedal boss (first pedal boss) 114L provided on the upper part 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.

The right portion of the brake shaft 112 projects outward from the second side wall 88R. A pedal boss (second 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 is operated 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. 19, a joint portion 116 is formed on the right portion of the brake shaft 112. The connecting portion 116 is composed of splines. Further, the joint 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 brake shaft 112 is inserted through the bearing cylinder 117. In other words, the bearing cylinder 117 surrounds the coupling portion 116. Further, the bearing cylinder 117 is provided concentrically with the brake shaft 112. The bearing cylinder 117 has a large diameter portion 117a that abuts on and is welded to the outer surface of the second side wall 88R. The coupling portion 116 has a protruding portion 116a that protrudes from the right end portion of the large diameter portion 117a to the outside of the machine body (the side opposite to the arrangement side of the first brake pedal 111L). Further, 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 brake shaft 112 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.

A bush (referred to as a first bush) 121 is provided inside the bearing cylinder 117. The first bush 121 is composed of a so-called DU bush and is fitted to the outside of the bearing portion 119a. The first bush 121 is in contact with the inner peripheral surface of the bearing cylinder 117 and is in contact with the outer peripheral surface of the bearing portion 119a. Therefore, the brake shaft 112 is supported by the bearing cylinder 117 via the bearing portion 119a and the first bush 121.

As shown in FIG. 20, 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. 20, 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 FIG. 17, 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 depression direction (counter-depression 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 FIG. 18, the master cylinder 123 is attached to a bracket member 125 fixed to the second side wall 88R. A mounting stay 126 is fixed to the bracket member 125, and a detection switch 127 is mounted on the mounting stay 126. The brake arm 118 is provided with a contact member 128 that abuts on the detection switch 127. When the contact member 128 comes into contact with the detection switch 127, the positions of the first brake pedal 111L and the second brake pedal 111R before being depressed can be detected.

As shown in FIGS. 17 and 18, a return spring 131 is provided inside the steering column 87 to return the brake pedals 111L and 111R to the positions before the operation (the set position at the time of non-operation). The return spring 131 is arranged on the right side between the first side wall 88L and the second side wall 88R. The return spring 131 is composed of a torsion coil spring and is provided so as to surround the periphery of the brake shaft 112. In the present embodiment, the return spring 131 is provided so as to surround the outer periphery of the bearing cylinder 117. One end (left end) 131a of the return spring 131 is hooked on the spring hooking portion 118a of the brake arm 118. 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.

The second pedal boss 114R is fitted from the right side to the protruding portion 116a of the coupling portion 116 and is spline-coupled. As a result, the second pedal boss 114R rotates integrally with the brake shaft 112. Further, the second pedal boss 114R has a shaft support portion 132 inserted into the bearing cylinder 117. A second bush (another bush) 133 provided on the inner peripheral side of the bearing cylinder 117 is fitted on the outer periphery of the shaft support portion 132. The second bush 133 is composed of a so-called DU bush. The second bush 133 is in contact with the inner peripheral surface of the bearing cylinder 117 and is in contact with the outer peripheral surface of the shaft support portion 132. Therefore, the brake shaft 112 is supported by the bearing cylinder 117 via the shaft support portion 132 and the second bush 133. The second pedal boss 114R is prevented from being pulled out by a bolt or the like screwed into the brake shaft 112.

The second brake pedal 111R is selectively (optionally) provided on the working machine 1. When the second brake pedal 111R is not provided, a member having substantially the same configuration as the second pedal boss 114R is attached.
As shown in FIG. 17, a brake oil tank 134 for storing brake oil is provided inside the steering column 87. The brake oil tank 134 is arranged between the first side wall 88L and the second side wall 88R and on the left side. That is, it is arranged inside the first side wall 88L. Further, the brake oil tank 134 is arranged below the brake shaft 112. Further, the brake oil tank 134 is attached to a mounting stay 135 bolted to the inside of the first side wall 88L. The brake oil tank 134 is connected to the master cylinder 123 by a connecting tube 136.

As shown in FIG. 21, the front panel 141 has a cover panel 144 at the bottom having an opening 144A that allows access to the brake oil tank 134 from the front of the cabin 14. As shown in FIG. 22, the cover panel 144 has a removable cover 144B that closes the opening 144A. The removable cover 144B is fixed to the main body portion of the cover panel 144 by bolts 170 and is removable. By removing the removable cover 144B, the brake oil can be replenished to the brake oil tank 134 from the outside of the cabin 14. In addition, it is possible to maintain the parts and the like arranged in the steering column 87.

The return spring 131 is formed by a torsion coil spring and provided on the outer periphery of the coupling portion 116 of the brake shaft 112, and the coupling portion 116 is supported by the bearing cylinder 117 via the arm boss 119 of the brake arm 118 and the first bush 121. Thereby, the support structure of the brake shaft 112 can be made compact.
Further, by making the support structure of the brake shaft 112 compact, it is possible to secure a space for arranging the brake oil tank 134 in the steering column 87. Further, by accommodating the brake oil tank 134 in the steering column 87, it is possible to reduce the number of parts that obstruct the view in the cabin room as compared with the case where the brake oil tank 134 is arranged in the cabin room, and it is possible to reduce the parts that obstruct the view from the cabin room to the outside. It is possible to improve the visibility when looking at.

Further, by forming the return spring 131 by the torsion coil spring, the reliability of the operation of the brake pedal can be improved.
The brake oil tank 134 is arranged on the right side between the first side wall 88L and the second side wall 88R, and the master cylinder 123, the return spring 131, the bearing cylinder 117, the brake arm 118 and the like are arranged on the first side wall 88L and the second side wall 88L. It may be arranged on the left side between the side wall 88R.

As shown in FIG. 23, the seat base 76 is attached to the bottom wall 74, and the driver's seat 13 is attached to the seat base 76. Further, the air conditioner main body 70 is arranged below the driver's seat 13 (inside the seat stand 76). The air conditioner main body 70 is attached to the bottom wall 74. Further, the air conditioner main body 70 is arranged at the center of the machine body 2 in the body width direction K2. The air conditioner main body 70 has a case, a blower, an evaporator, and the like housed in the case, and constitutes the main body of the air conditioner equipped in the work machine 1. A storage box 175 is provided on the lower surface side of the upper wall of the seat base 76. The front side of the storage box 175 can be opened and closed by a lid member 176. The storage box 175 can store, for example, a booklet such as an instruction manual.

As shown in FIG. 24, the working machine 1 includes a duct structure 151 for circulating the conditioned air blown out from the outlet 70a of the air conditioner main body 70. The outlet 70a is provided in the front portion of the air conditioner main body 70 and opens forward. The duct structure 151 has a first duct 152 and a second duct (third member) 153.
As shown in FIG. 23, the first duct 152 is connected to the outlet 70a and extends forward (lower part of the steering column 87) through the lower side of the floor portion 75 (opening / closing cover 78) of the cabin 14. do. The second duct 153 is connected to the front portion of the first duct 152 and rises inside the steering column 87 (see FIG. 27). The air conditioner main body 70, the first duct 152, and the second duct 153 are arranged at the center of the machine body width direction K2.

As shown in FIG. 23, the first duct 152 has a first member 154 having a connection port (referred to as a first connection port) 154a connected to the outlet 70a, and a first member 154 extending forward from the first member 154. It has two members 155.
As shown in FIG. 25, the first member 154 has a connecting portion 154b connected to the second member 155 at the front portion. The connection portion 154b is located below the first connection port 154a and is attached to the bottom wall (installation portion) 74 by bolts 177 or the like (see FIG. 26). Further, the front end (butting end portion) 154c of the connecting portion 154b is formed in an inclined shape that shifts downward toward the front. A plurality of sealing materials (first sealing material 156A, first sealing material 156B) are provided on the connecting portion 154b. The first sealing material 156A and the first sealing material 156B are formed in an annular shape, are arranged at intervals in the front-rear direction K1, and are fitted on the outer periphery of the connecting portion 154b. The first sealing material may be one or three or more.

The second member 155 is formed in a long tubular shape (cylindrical shape with a rectangular cross section) in the front-rear direction K1. As shown in FIG. 25, the second member 155 extends forward from the connecting portion 154b of the first member 154. Specifically, as shown in FIG. 23, the second member 155 extends forward from between the front end side of the bottom wall 74 and the rear end side of the floor portion 75 (open / close cover 78), and is the lower side of the open / close cover 78. It extends through to the inside of the third portion 81 of the floor frame 72. In other words, the second member 155 extends from the first member 154 to the lower part of the second duct 153. As shown in FIG. 24, the second member 155 is located below the opening / closing cover 78, and the inspection opening 77a is long in the machine width direction K2. That is, the inspection opening 77a is formed so as to cross the second member 155 in the machine width direction K2 in a plan view. The second member 155 may be provided so as to fit within the inspection opening 77a.

As shown in FIG. 23, the second duct 153 has a connection port (referred to as a second connection port) 153a directed toward the rear at the lower part. The second connection port 153a is located in the third portion 81 of the floor frame 72.
As shown in FIG. 25, the second member 155 is inserted into and connected to the second connection port 153a (lower part of the second duct 153) at the front portion (one end side in the longitudinal direction) (first insertion port). Site) has 155a. The front end (connection end) 155b of the insertion port 155a is formed in an inclined shape that shifts downward toward the rear. This makes it easier to connect the second member 155 in a backward tilted posture. Specifically, the second member 155 can be easily inserted into the second connection port 153a in a backward tilted posture in which the rear end side is arranged above the front end side (it can be inserted).

Further, the second member 155 has a connecting portion (second portion) 155c which is butt-connected to the connecting portion 154b of the first member 154 at the rear portion (the other end side in the longitudinal direction). The rear end (butting end portion) 155d of the connecting portion 155c is formed in an inclined shape that shifts downward as it goes forward. As a result, when the rear portion of the second member 155 is lowered from above and connected to the first member 154, the connection can be easily performed. A plurality of sealing materials (second sealing material 156C, second sealing material 156D) are provided in the connecting portion 155c. The second sealing material 156C and the second sealing material 156D are formed in an annular shape, are arranged at intervals in the front-rear direction K1, and are fitted on the outer periphery of the connecting portion 155c. The number of the second sealing material may be one, or three or more may be provided.

As shown in FIG. 25, a cover plate 157 is provided over the connection portion 154b of the first member 154 and the connection portion 155c of the second member 155. As shown in FIG. 26, the cover plate 157 includes an upper wall 157a, a first side wall extending downward from the left end of the upper wall 157a, and a second side wall extending downward from the right end of the upper wall 157a. It has 157c. The upper wall 157a covers above the connecting portion 154b and the connecting portion 155c. The first side wall 157b covers the left side of the connecting portion 154b and the connecting portion 155c. The second side wall 157c covers the left side of the connecting portion 154b and the connecting portion 155c. The upper wall 157a, the first side wall 157b and the second side wall 157c can be closely attached to the first sealing material 156A, 156B and the second sealing material 156C, 156D.

As shown in FIG. 26, the first side wall 157b has a flange wall 157d extending to the left at the lower end, and the second side wall 157c has a flange wall 157e extending to the right at the lower end. The flange wall 157d and the flange wall 157e are fixed to the bottom wall 74 by bolts 177. As a result, the connection portion 154b and the connection portion 155c are pressed by the cover plate 157. The first sealing material 156A, 156B, the second sealing material 156C, 156D, and the cover plate 157 ensure the sealing property of the abutting portion between the connecting portion 154b and the connecting portion 155c.

In the above duct structure 151, the second member 155 is attached as follows.
First, with the open / close cover 78 removed, the second member 155 is tilted backward and the insertion port 155a is inserted into the second connection port 153a, while the rear portion of the second member 155 is lowered to the rear end of the connection portion 155c. The 155d is attached to the front end 154c of the connecting portion 154b. After that, the cover plate 157 is attached to the bottom wall 74.

The second member 155 is removed by the reverse operation of the above operation.
In the first duct 152, the second member 155, which is a portion corresponding to the inspection opening 77a, can be attached and detached, and by removing the second member 155, there are no members that interfere with the inspection, and the inspection can be easily performed. Can be done.
The mounting structure of the second member 155 is not limited to the above structure. For example, the rear portion of the second member 155 is inserted into and connected to the first member 154, and the front portion of the second member 155 is connected. 2 It may be connected to the duct 153 in a matching manner.

As shown in FIG. 27, the second duct 153 rises upward from the second connection port 153a inside the steering column 87. Further, as shown in FIG. 28, the second duct 153 stands up behind the column frame 88.
As shown in FIG. 28, the second duct 153 has a lower base portion 158 and an upper branch portion (branch portion) 159. The base portion 158 has a second connection port 153a and is located at the bottom of the column frame 88. The branch portion 159 extends upward from the base portion 158 and branches in a bifurcated manner by avoiding the steering post 91. Specifically, the branch portion 159 has a first branch portion 160L located on the left side of the steering post 91 and a second branch portion 160R located on the right side of the steering post 91.

The first branch portion 160L extends above the column frame 88 through the back surface side of the one side wall portion 83L. The second branch portion 160R extends above the column frame 88 through the back surface side of the other side wall portion 83R. Further, the upper portion of the first branch portion 160L is located in the upper portion of the first cover member 96 and the second cover member 97. The upper part of the second branch portion 160R is located in the upper part of the first cover member 96 and the second cover member 97 (see FIG. 28).

As shown in FIG. 29, the first branch portion 160L has a first connection portion 161L that bends downward at the tip portion (upper portion). The first connection portion 161L has an opening directed downward. The second branch portion 160R has a second connection portion 161R that bends downward at the tip portion (upper portion). The second connection portion 161R has an opening directed downward.

As shown in FIG. 29, the duct structure 151 has a first side duct 162L connected to the first branch 160L and a second side duct 162R connected to the second branch 160R.
As shown in FIG. 28, the first side duct 162L is arranged on the left side (one side) of the upper part of the column frame 88 (the upper part of the steering column 87). The first side duct 162L has a first side main body 163L extending from the column frame 88 side toward the left, and a first extending portion 164L extending upward from the right part of the first side main body 163L.

As shown in FIG. 29, the first side portion main body 163L has a plurality of blowout portions (first blowout portion 166A and first blowout portion 166B) on the rear side of the upper portion, and has a blowout portion (first blowout portion 166B) on the front side of the upper portion. 3 It has a blowout unit 168L). The first blowing section 166A and the first blowing section 166B blow conditioned air into the cabin room. As shown in FIG. 27, the first lower portion 146L of the front window 146 is located in front of the first side duct 162L, and the third blowout portion 168L directs the conditioned air toward the first lower portion 146L. And blow out. As shown in FIG. 13, the first extension portion 164L is inserted into the column cover 89 through the left portion of the second portion 98b of the third cover member 98. As shown in FIG. 29, the first connecting portion 161L is connected to the first extending portion 164L from above. This makes it easy to assemble.

Further, the first side main body 163L is arranged below the second portion 98b of the third cover member 98. Further, the first brake pedal 111L is arranged below the first side main body 163L (see FIG. 28).
As shown in FIG. 28, the second side duct 162R is arranged on the right side (other side) of the upper part of the column frame 88. The second side duct 162R has a second side main body 163R extending from the column frame 88 side toward the right, and a second extending portion 164R extending upward from the left side of the second side main body 163R.

As shown in FIG. 29, the second side main body 163R has a plurality of blowout portions (second blowout portion 167A and second blowout portion 167B) on the rear side of the upper portion, and has a blowout portion (second) on the front side of the upper portion. 3 It has a blowout unit 168R). The second blowing section 167A and the second blowing section 167B blow conditioned air into the cabin room. As shown in FIG. 27, the second lower portion 146R of the front window 146 is located in front of the second side duct 162R, and the third blowout portion 168R directs the conditioned air toward the second lower portion 146R. And blow out. The second extending portion 164R is inserted into the column cover 89 through the right portion of the second portion 98b of the third cover member 98. As shown in FIG. 29, the second connecting portion 161R is connected to the second extending portion 164R from above. This makes it easy to assemble.

Further, the second side main body 163R is also arranged below the second portion 98b of the third cover member 98. Further, the second brake pedal 111R is arranged below the second side duct 162R (see FIG. 28).
The first blowing portion may be one or three or more. Further, the number of the second blowing portions may be one, or may be three or more. Further, a plurality of third blowout portions 168L may be provided, and a plurality of third blowout portions 168R may also be provided.

The upper part of the second duct 153 is bent downward, and the side ducts (162L, 162R) are provided with an extension portion (164L, 164R) extending upward, and the upper part and the side of the second duct 153. By connecting to the extension part of the part duct, the height position of the side duct can be lowered downward. This makes it possible to improve the visibility from the front window 146 (first lower portion 146L, second lower portion 146R).

By arranging the duct structure 151 in the steering column 87 through the lower surface side of the floor portion 75 and by accommodating the brake oil tank 134 in the steering column 87, the left and right sides of the steering column 87 in the front part of the cabin room It is possible to eliminate the parts that obstruct the view. As a result, the upper surfaces of the first side main body 163L and the second side main body 163R can be arranged further below the second cover member 97 of the steering column 87 arranged below the steering 15, so that the front can be arranged. The lower left portion and the lower right portion of the portion window 146 can be extended below the second cover member 97, and the forward visibility can be improved.

The working machine of the present embodiment has the following effects.
The work machine 1 connects the machine body 2, the lift arm 8 mounted on the machine body 2 so as to be able to swing up and down, the work tool 9 mounted on the front portion of the lift arm 8, and the lift arm 8 and the work tool 9. A quick coupler 32 having a connecting pin (first pin 40L, second pin 40R), a coupler cylinder 42 for moving the connecting pin to disconnect and connect, and a coupler cylinder 42 for disconnecting. A locking release valve 61 that operates is provided, and the unlocking valve 61 is attached to a quick coupler 32.

According to this configuration, it is possible to simplify the arrangement of hydraulic pipelines.
Further, the lift arm 8 includes a first arm 8L and a second arm 8R provided so as to be spaced apart from each other in the width direction of the machine body and gradually widened as the spacing goes forward, and the connecting pin is the first arm. It includes a first pin 40L provided on the front portion of the 8L and a second pin 40R provided on the front portion of the second arm 8R.

According to this configuration, the state of the connecting pin can be easily visually recognized from the driver's seat 13, and the ease of checking the state of the connecting pin can be enhanced.
Further, the quick coupler 32 has a first engaging portion (engagement pin 39L) that engages with the work tool 9 on the first arm 8L side and can be engaged with and detached from the work tool 9 on the second arm 8R side. The second engaging portion (engaging pin 39R) engaged with the first engaging portion, the first plate 41L connecting the first engaging portion and the first pin 40L, and the second engaging portion and the second pin 40R are connected to each other. The lock release valve 61 is attached to the first plate 41L or the second plate 41R.

According to this configuration, the piping route between the coupler cylinder 42 and the lock release valve 61 can be simplified.
Further, the first hydraulic line 52L arranged along the first arm 8L and the first hydraulic line 52L connected to the front part of the first arm 8L from the machine body 2 side and attached to the first plate 41L. The first connection member 63L, the second hydraulic line 52R arranged along the second arm 8R from the machine body 2 side to the front part of the second arm 8R, and the second hydraulic line 52R are connected. It also includes a second connecting member 63R attached to the second plate 41R.

By allocating the hydraulic pipelines arranged from the machine body 2 side to the front part of the lift arm 8 to the first arm 8L and the second arm 8R, the piping route can be simplified.
Further, the first connection member 63L has a first take-out unit 56L capable of taking out hydraulic oil and a first output unit 57L capable of outputting hydraulic oil, and the second connection member 63R can take out hydraulic oil. The second output unit 56R and the second output unit 57R capable of outputting hydraulic oil are provided, one of the first output unit 57L or the second output unit 57R is connected to the head side of the coupler cylinder 42, and the other is connected to the head side of the coupler cylinder 42. Connected to the unlock valve.

According to this configuration, it is possible to simplify the piping route to the coupler cylinder 42.
Further, the lock release valve 61 has a main body valve 61A for operating the coupler cylinder 42 and a solenoid unit 61B for controlling the main body valve 61A. According to this configuration, for example, the regulation of the operation of the lock release valve is electrically regulated. It is easy to do and can increase the certainty of unlocking.

A cover member 64 that covers the solenoid portion 61B is provided.
According to this configuration, the solenoid unit 61B can be protected.
Further, the working machine 1 extends forward from the machine body 2 and the machine body 2, and is provided with a space in the machine body width direction K2 and gradually expands as the distance goes forward. The arm 8R, the work tool 9 mounted on the front of the first arm 8L and the second arm 8R, the preliminary control valve 38 for controlling the hydraulic actuator mounted on the work tool 9, and the first from the preliminary control valve 38. A first hydraulic line 52L arranged along the first arm 8L to the front part of the arm 8L and an arrangement along the second arm 8R from the preliminary control valve 38 to the front part of the second arm 8R. The second hydraulic line 52R is connected to the first connection member 63L having the first take-out portion 56L to which the first hydraulic line 52L is connected and the hydraulic oil can be taken out, and the second hydraulic line 52R is connected and operates. A second connecting member 63R having a second take-out portion 56R capable of taking out oil is provided.

According to this configuration, it is possible to simplify the arrangement of hydraulic pipelines in the external hydraulic pressure take-out structure.
Further, a connecting pipe 26 for connecting the first arm 8L and the second arm 8R is provided, and the connecting pipe 26 is formed in an elliptical shape having a cross-sectional shape long in the longitudinal direction of the first arm 8L and the second arm 8R. The 1 hydraulic line 52L and the 2nd hydraulic line 52R are arranged so as to pass through the lower side of the connecting pipe 26.

According to this configuration, it is possible to improve the visibility in front of the aircraft from the driver's seat.
Further, the first pin 40L connecting the first arm 8L and the working tool 9, the second pin 40R connecting the second arm 8R and the working tool 9, and the first pin 40L for releasing and connecting the connection. A coupler cylinder 42 for moving the second pin 40R and a lock release valve 61 for operating the coupler cylinder 42 to release the connection are provided, and the first connection member 63L is provided with hydraulic oil on the head side of the coupler cylinder 42. The second output unit 63R has a first output unit 57L capable of outputting to the lock release valve 61, and the second connection member 63R has a second output unit 57R capable of outputting hydraulic oil to the lock release valve 61.

According to this configuration, it is possible to simplify the arrangement structure of the hydraulic line with respect to the coupler cylinder 42.
Further, the coupler cylinder 42 has a cylinder tube 42A extending in the machine width direction K2 between the front portions of the first arm 8L and the second arm 8R, and the first pin 40L is one end of the cylinder tube 42A. The second pin 40R is provided on the side so as to be movable in the machine width direction, and the second pin 40R is provided on the other end side of the cylinder tube 42A so as to be movable in the machine width direction.

According to this configuration, the structure of the quick coupler 32 can be simplified.
Further, the working machine 1 includes a machine body 2, a cabin 14 mounted on the machine body 2, a steering column 87 provided in the front portion of the cabin 14, and a brake oil tank 134 for storing brake oil. , The brake oil tank 134 is arranged in the steering column 87.

According to this configuration, it is possible to improve the livability in the cabin room and the visibility when looking at the outside from the cabin room as compared with the case where the brake oil tank is installed in the cabin room.
Further, it is provided with a removable cover 144B that can be removed and closed the opening 144A that can access the brake oil tank 134 from the front of the cabin 14.

According to this configuration, the brake oil can be replenished to the brake oil tank 134 from the front of the cabin 14.
Further, the removable cover 144B constitutes a part of the front panel 141 of the cabin 14.
According to this configuration, it is possible to simplify the structure by using the members for both purposes.

Further, the steering column 87 includes a brake pedal 111L and a return spring 131 for returning the brake pedal 111L to the position before the operation, and the steering column 87 is provided with a first side wall 88L and a second side wall 88L provided at intervals in the body width direction K2. It has a side wall 88R, the brake oil tank 134 is arranged inside one of the first side wall 88L or the second side wall 88R, and the return spring 131 is composed of a torsion coil spring and has a first side wall 88L and a second side wall 88R. It is provided so as to surround the brake shaft 112 provided over the entire surface and is arranged inside the other of the first side wall 88L or the second side wall 88R.

According to this configuration, the support structure of the brake pedal 111L can be made compact, and the space for arranging the brake oil tank 134 can be secured in the steering column 87.
Further, a master cylinder 123 operated by the brake pedal 111L is provided, and the master cylinder 123 is provided between the first side wall 88L and the second side wall 88R and on the side where the return spring 131 is arranged.

According to this configuration, it is possible to secure a space for arranging the brake oil tank 134 in the steering column 87.
Further, a driver's seat 13 provided in the cabin 14 and a console 104 provided on the right side of the driver's seat 13 are provided, and the cabin 14 has a front support 142R and a console 104 on the right side of the cabin 14. It has a side panel 171 that includes a permeation site 171a that is visible to the outside from between.

According to this configuration, it is possible to improve the visibility when visually recognizing the side of the cabin 14 from the driver's seat 13.
Further, the working machine 1 includes a driver's seat 13, a steering wheel 15 arranged in front of the driver's seat 13, a steering column 87 covering the steering post 91 supporting the steering wheel 15, and an air conditioner provided below the driver's seat 13. The main body 70 and the duct structure 151 for circulating the air-conditioned air blown out from the outlet 70a of the air conditioner main body 70 are provided, and the duct structure 151 is connected to the outlet 70a and surrounds the driver's seat 13. The first duct 152 extending from the lower side of the floor portion 75 of 14 toward the lower part of the steering column 87, and the second duct 153 connected to the front portion of the first duct 152 and rising inside the steering column 87. And have.

According to this configuration, it is possible to improve the livability in the cabin room and the visibility when looking at the outside from the cabin room.
Further, the duct structure 151 extends from the upper part of the steering column 87 toward one side in the body width direction K2, and has a first side duct 162L having first blowing portions 166A and 166B for blowing air conditioning air into the cabin room. The second duct has a second side duct 162R having second outlets 167A and 167B that extend from the upper part of the steering column 87 toward the other side of the aircraft width direction K2 and blow out air-conditioned air into the cabin room. The 153 branches to the left side and the right side of the steering post 91 inside the steering column 87, and the first side duct 162L becomes a first branch 160L which is one of the branch portions of the second duct 153. The second side duct 162R is connected to the second branch 160R, which is the other portion of the branch of the second duct 153.

According to this configuration, the duct structure 151 can be satisfactorily distributed to the left side duct and the right side duct in the steering column 87.
Further, the first side duct 162L has a first extending portion 164L extending upward, and the second side duct 162R has a second extending portion 164R extending upward. The tip of the first branch 160L is bent downward and connected to the first extension 164L from above, and the tip of the second branch 160R is bent downward. It is connected to the second extension portion 164R from above.

According to this configuration, the assembly of the first side duct 162L and the first branch portion 160L and the assembly of the second side duct 162R and the second branch portion 160R can be easily performed. Further, the height positions of the first side duct 162L and the second side duct 162R can be lowered, and the visibility in front of the machine body can be improved.
Further, the front panel 141 of the cabin 14 has a front window 146 having transparency so that the front can be visually recognized, and the front window 146 is a one-sided and first side duct 162L of the upper part of the steering column 87. It has a first lower portion 146L located in front and a second lower portion 146R located on the other side of the upper part of the steering column 87 and in front of the second side duct 162R.

According to this configuration, the visibility in front of the airframe can be further improved.
Further, the floor portion 75 has a floor body 77 having an inspection opening 77a and an opening / closing cover 78 for closing the inspection opening 77a, and the first duct 152 has a removable portion corresponding to the inspection opening 77a.
According to this configuration, the member that interferes with the inspection can be removed, and the inspection below the floor portion 75 can be easily performed.

Further, the working machine 1 includes an air conditioner main body 70 and a duct structure 151 for circulating air-conditioned air blown out from the air-conditioning port 70a of the air-conditioning main body 70, and the duct structure 151 is connected to the air-conditioning port 70a. It has a first member 154, a second member 155 extending from the first member 154, and a third member (second duct 153) to which the second member 155 is connected, and the second member 155 is in the longitudinal direction. It has a first part (insertion port 155a) on one end side and a second part (connection part 155c) on the other end side, and the first part is inserted into one of the first member 154 or the third member. The second portion is connected to the first member 154 or the other of the third member in an associative state.

According to this configuration, the second member 155 constituting the duct structure 151 can be easily removed and attached.
Further, in the second member 155, the first portion is inserted into one of the first member 154 or the third member in an inclined state in which the second member 155 shifts upward from the first portion side to the second portion side, and from the inclined state. By moving the second portion downward, the second portion can be connected to the first member 154 or the other of the third members in a mated state.

According to this configuration, the second member 155 can be easily removed and attached.
Further, the connecting end (front end 155b) of the first portion is formed in an inclined shape that shifts downward from the first portion side toward the second portion side.
According to this configuration, the insertion on one end side of the second member 155 can be easily performed.
Further, the butt end portion (rear end 155d) of the second portion is formed in an inclined shape that shifts downward from the second portion side toward the first portion side, and the first member to which the second portion is connected is formed. The butt end portion (front end 154c) of the 154 or the third member is formed in an inclined shape corresponding to the butt end portion of the second portion.

According to this configuration, the connection on the other end side of the second member 155 can be easily performed.
Further, the installation portion (bottom) is covered from the second portion over the connection portion 154b of the first member 154 or the third member connected to the second portion via the sealing material, and the second portion and the connection portion 154b are installed. It is provided with a cover plate 157 that can be attached to the wall 74).
According to this configuration, the other end side of the second portion can be fixed while ensuring the sealing property.

Further, the sealing material includes an annular first sealing material 156A and 156B provided on the outer periphery of the second portion and an annular second sealing material 156C and 156D provided on the outer periphery of the connecting portion, and the cover plate 157 includes an annular first sealing material 156C and 156D. The first sealing material 156A, 156B and the second sealing material 156C, 156D are pressed and attached to the installation portion.
According to this configuration, the sealing property on the other end side of the second member 155 can be improved.

Further, the cabin 14 mounted on the machine body 2 is provided, the floor portion 75 has a floor body 77 having an inspection opening 77a, and an opening / closing cover 78 for closing the inspection opening 77a, and the second member 155 is the cabin 14 of the cabin 14. It extends forward through the underside of the floor 75.
According to this configuration, by removing the second member 155, the inspection can be easily performed through the inspection opening 77a.

Further, the working machine 1 includes a steering 15, a steering post 91 that supports the steering 15, and a steering column 87 that covers the steering post 91. The steering column 87 is located on the upper surface side of the steering column 87 and is steered 15. It has switch panels (first switch panel 99L, second switch panel 99R) arranged below the steering post 91, and the switch panels are arranged on both sides of the steering post 91 in the body width direction K2 and face forward in a plan view. It has a first switch group 101 including a plurality of switches (first switch 101A to fourth switch 101D) provided in an inclined manner so as to move outward from the machine body 2.

According to this configuration, the operability of the switches can be improved by providing a plurality of switches on both sides of the steering post 91 in the body width direction K2 in an inclined manner in which the switches move outward to the body 2 as they move forward. can. Further, a plurality of switches can be compactly arranged on the upper surface side of the steering column 87.
Further, the first switch group 101 includes the first switch 101A and the second switch 101B arranged side by side on one side of the steering post 91, and the third switch group 101 arranged side by side on the other side of the steering post 91. It has a switch 101C and a fourth switch 101D.

According to this configuration, the first switch 101A to the fourth switch 101D can be arranged compactly.
Further, the first switch 101A to the fourth switch 101D are seesaw switches in which one end side and the other end side in the inclination direction are pressed.
According to this configuration, the operability of the first switch 101A to the fourth switch 101D is good.

Further, the first switch 101A is a release switch that enables the release operation of the connection of the work tool 9, and the second switch 101B is a regeneration switch that operates an exhaust gas purification device that purifies the exhaust gas. The switch 101C is a light switch for turning on or off the light, and the fourth switch 101D is a parking switch for restricting movement during parking.
With this configuration, the main switches can be easily accessed.

Further, the driver's seat 13 arranged behind the steering wheel 15, the console 104 arranged on the side of the driver's seat 13, and the control lever 16 provided at the front portion of the console 104 are provided, and the console 104 has a control lever 16. A second switch including a switch installation portion 105 provided in front of and below the control lever 16 and a plurality of switches (fifth switch 106A to seventh switch 106C) arranged side by side in the body width direction K2 in the switch installation portion 105. It has a group 106.

According to this configuration, the control lever 16 can regulate the unintended operation of the switch located at the front of the console 104.
Further, the second switch group includes the fifth switch 106A to the seventh switch 106C arranged side by side in the aircraft width direction K2.
According to this configuration, the fifth switch 106A to the seventh switch 106C can be arranged compactly.

The fifth switch 106A to the seventh switch 106C are seesaw switches that are swung back and forth.
According to this configuration, the interval between the fifth switch 106A and the seventh switch 106C can be narrowed, and the fifth switch 106A to the seventh switch 106C can be arranged compactly.

Further, the fifth switch 106A is a hold switch that keeps the hydraulic oil flowing in a certain direction with respect to the hydraulic attachment mounted on the working machine 1, and the sixth switch 106B supports the hydraulic attachment so as to be able to swing up and down. It is a float switch that makes the lift arm 8 float, and the seventh switch 106C is an unload switch that regulates the operation of the lift arm 8 and the hydraulic attachment.

According to this configuration, operability can be improved by centrally arranging the switches of the work system.
Further, a cabin 14 surrounding the driver's seat 13 is provided, the console 104 is provided on the right side of the driver's seat 13, and the cabin 14 has a right door having a transparent door window and a right side of the cabin 14. Includes a boarding / alighting passage 173 provided between the front strut 142R and the console 104.

According to this configuration, the outdoor view of the cabin 14 can be seen from between the front column 142R on the right side and the console 104, and the visibility can be improved.
Further, the working machine 1 has a steering column 87 that supports the steering 15, a brake shaft 112 that is rotatably supported by the steering column 87 around the axis extending in the body width direction K2, and a side of the steering column 87. It comprises a brake pedal 111L arranged and rotatably mounted integrally with the brake shaft 112, and a return spring 131 for returning the brake pedal 111L to the position before operation, the return spring 131 being formed by a torsion coil spring. It is arranged inside the steering column 87 and is provided so as to surround the brake shaft 112.

According to this configuration, the support structure for supporting the brake pedal 111L can be compactly configured by forming the return spring 131 for returning the brake pedal 111L to the position before the operation by the torsion coil spring.
Further, a brake arm 118 that has an arm boss 119 that is integrally rotatably fitted on the outer periphery of the brake shaft 112 and operates the master cylinder 123 by operating the brake pedal 111L, a bearing cylinder 117 that supports the brake shaft 112, and a bearing. A bush (first bush 121) provided on the inner peripheral side of the cylinder 117 is provided, and the steering column 87 has a first side wall 88L and a second side wall 88R arranged to face each other in the body width direction K2, and has a brake. The shaft 112 has a coupling portion 116 that penetrates the first side wall 88L and the second side wall 88R and to which the arm boss 119 is coupled, and the bearing cylinder 117 is fixed to either the first side wall 88L or the second side wall 88R. The arm boss 119 also has a bearing portion 119a that is inserted into the bearing cylinder 117 and supported by the bearing cylinder 117 via a bush.

According to this configuration, the support structure of the brake pedal 111L can be further compacted.
Further, the return spring 131 is provided so as to surround the periphery of the bearing cylinder 117.
According to this configuration, the support structure of the brake pedal 111L can be further made compact.

Further, the coupling portion 116 has a protruding portion 116a protruding from the end portion of the bearing cylinder 117 to the side opposite to the arrangement side of the brake pedal 111L in the steering column 87.
According to this configuration, another brake pedal 111R can be selectively attached to the side of the steering column 87 opposite to the arrangement side of the brake pedal 111L.
Further, the brake pedal 111L includes another brake pedal 111R having a pedal boss (second pedal boss) 114R coupled to the protrusion 116a, and the pedal boss 114R is inserted into the bearing cylinder 117 and is on the inner peripheral side of the bearing cylinder 117. It has a shaft support 132 supported by a bearing cylinder 117 via another bush (second bush 133) provided.

According to this configuration, the support structure of the brake pedal can be made compact.
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 by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

15 Steering 87 Steering column 88L 1st side wall 88R 2nd side wall 111L Brake pedal (1st brake pedal)
111R Other brake pedal (second brake pedal)
112 Brake shaft 114R Pedal boss (2nd pedal boss)
116 Coupling part 116a Protruding part 117 Bearing cylinder 118 Brake arm 119 Arm boss 119a Bearing part 121 Bush (first bush)
133 Other bush (2nd bush)
123 Master cylinder 131 Return spring K2 Airframe width direction

Claims (5)

The steering column that supports the steering and
A brake shaft rotatably supported around the axis extending in the width direction of the aircraft on the steering column, and
A brake pedal arranged on the side of the steering column and rotatably attached to the brake shaft,
A return spring that returns the brake pedal to the position before it was operated,
A brake arm that has an arm boss that is integrally rotatable around the outer circumference of the brake shaft and that operates the master cylinder by operating the brake pedal.
A bearing cylinder that is fixed to the steering column and the brake shaft is inserted and supports the brake shaft by supporting the arm boss on the inner peripheral side.
Equipped with
The return spring is a working machine formed by a torsion coil spring, arranged inside the steering column, and provided so as to surround the periphery of the bearing cylinder . The steering column that supports the steering and
A brake shaft rotatably supported around the axis extending in the width direction of the aircraft on the steering column, and
A brake pedal arranged on the side of the steering column and rotatably attached to the brake shaft,
A return spring that returns the brake pedal to the position before it was operated,
A brake arm that has an arm boss that is integrally rotatable around the outer circumference of the brake shaft and that operates the master cylinder by operating the brake pedal.
The bearing cylinder that supports the brake shaft and
The bush provided on the inner peripheral side of the bearing cylinder and
Equipped with
The return spring is formed by a torsion coil spring, is arranged inside the steering column, and is provided so as to surround the brake shaft.
The steering column has a first side wall and a second side wall which are arranged so as to face each other in the width direction of the machine body.
The brake shaft has a joint portion that penetrates the first side wall and the second side wall and to which the arm boss is bonded.
The bearing cylinder is fixed to either the first side wall or the second side wall and surrounds the joint portion.
The arm boss is a working machine having a bearing portion inserted into the bearing cylinder and supported by the bearing cylinder via the bush. The working machine according to claim 2, wherein the return spring is provided so as to surround the periphery of the bearing cylinder. The joint has a protrusion that projects laterally from the end of the bearing cylinder to the steering column .
The working machine according to claim 2 or 3, wherein the brake pedal includes a first brake pedal arranged on the side opposite to the protruding portion of the steering column . The brake pedal comprises a second brake pedal having a pedal boss coupled to the protrusion.
The working machine according to claim 4, wherein the pedal boss has a shaft support portion inserted into the bearing cylinder and supported by the bearing cylinder via another bush provided on the inner peripheral side of the bearing cylinder.

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