JP6793572B2 - Work vehicle - Google Patents

Description

The present invention relates to a work vehicle capable of one-sided braking operation in which a braking force is applied to only one of the left and right traveling portions.

It is a work vehicle that can operate one-sided brakes by applying braking force to only one of the left and right traveling parts, and supports it so that it can swing up and down with the brake pedal shaft in the left-right direction located below the floor step as a fulcrum. A pair of left and right brake pedals are provided so as to project forward and upward from the base end portion on the brake pedal shaft side and the tip portion is located above the floor step, and the left and right brake pedals are connected and disconnected. A patent document configured to be able to switch between a one-brake prevention state in which the left and right brake pedals are integrally operated and a one-brake enable state in which the left and right brake pedals can be operated separately by a switching mechanism for switching between. The work vehicle according to 1 is conventionally known.

Japanese Unexamined Patent Publication No. 2013-230737

In the work vehicle of the above document, the switching mechanism is provided on the tread side of the brake pedal, so that the brake pedal shaft is arranged below the floor step used for a relatively small traveling vehicle. Also, the left and right brake pedals can be switched between the one-brake prevention state and the one-brake possible state on the pedal body side, but since the switching tool is provided on the tread plate side, mud or the like is generated when the operator steps on the pedal. Is easy to adhere to, and it is necessary to separately provide a cover body and perform regular maintenance. In addition, there is a problem that the footboard side may become large and the space on the foot side of the operator may be narrowed.

The present invention provides left and right brake pedals in which the brake pedal shafts are arranged under the floor step, and the left and right brakes can be operated in a one-sided brake operation in which a braking force is applied to only one of the left and right traveling portions. An object of the present invention is to provide a work vehicle in which a switching mechanism for switching between connecting and disconnecting pedals can be arranged more compactly.

In order to solve the above problems, the present invention is firstly a work vehicle capable of one-sided braking operation in which a braking force is applied to only one of the left and right traveling portions 2 and 2, and is located below the floor step 12. It is supported so as to be swingable up and down with the brake pedal shaft 21 in the left-right direction arranged in the above as a fulcrum, and is formed so as to project forward and upward from the base end portion 22 on the brake pedal shaft 21 side, and the tip portion is formed from the floor step 12. By operating a pair of left and right brake pedals 14L and 14R having an arm portion 23 located above, a pedal body portion 24 integrally installed at the tip portion of the arm portion 23, and a brake pedal 14 on one of the left and right sides. A braking device 15 that applies a braking force to the traveling portion 2 on one of the left and right sides and also applies a braking force to the traveling portion 2 on the left and right other side by operating the brake pedal 14 on the left and right other side, and the left and right brake pedals. The one-sided brake prevention state in which the left and right brake pedals 14 are integrally operated by connecting the 14 and the left and right brake pedals 14 can be operated separately by disconnecting the left and right brake pedals 14. A switching mechanism 20 for switching to one of the one-side brake enabled states is provided, the switching mechanism 20 is arranged directly behind the brake pedal shaft 21, and the switching mechanism 20 is a connecting arm shaft 33a in the vertical direction. It has a connecting arm 33 that switches between the one-brake prevention state and the one-brake enable state by rotating back and forth with the brake pedal shaft 21 as a fulcrum, and is located behind the connecting arm 33 on the outer peripheral surface side of the brake pedal shaft 21. It is characterized in that a regulating portion 22b that regulates the rotation range of the above is formed .

Secondly , an operating tool 17 for operating the switching between the one-brake prevention state and the one-brake enable state by the connecting arm 33 is provided, and the connecting arm shaft 33a is arranged closer to the brake pedal 14L located on the left and right inside. The wire 39 is connected to the left and right inside of the connecting arm shaft 33a in the connecting arm 33, and the connecting arm 33 and the operating tool 17 are connected by a linking mechanism including the wire 39. ..

Third, a mounting portion 32 in which the connecting arm 33 is mounted and supported so as to be rotatable back and forth by the connecting arm shaft 33a is formed in a cube shape, and the mounting portion 32 is fixed to the brake pedal 14L side on one of the left and right sides. It is characterized by that.

Fourth, on the brake pedal shaft 21 side of at least one brake pedal 14R, a connected arm 34 that swings up and down integrally with the arm portion 23 with the brake pedal shaft 21 as a fulcrum projects rearward. The connected arm 34 is targeted for connection / disconnection by the switching mechanism 20, and a cover body 36 that covers the lower part of the connected arm 34 and the switching mechanism 20 is provided, and the cover body 36 is provided. Is characterized by having a scraper portion for scraping off the deposits adhering to the side surface of the connected arm 34.

Fifth, the switching mechanism 20 is centrally arranged on one side of the left and right brake pedals 14L.

One-sided brakes on the left and right brake pedals in a work vehicle where one-sided braking is possible by applying braking force to only one of the left and right traveling parts by the left and right brake pedals on which the brake pedal shafts are arranged under the floor step. By arranging the switching tool for switching between the preventive state and the one-brake enabled state behind the brake pedal shaft, the switching tool can be arranged by effectively utilizing the space below the floor step, and at the vicinity of the operator's feet. The circumference of the pedal body can be made compact.

Further, according to the switching mechanism arranged directly behind the brake pedal shaft, the movable range of the switching mechanism can be narrowed, so that the structure can be made more compact.

Further, according to the switching mechanism having a connecting arm (33) that switches between the one-brake prevention state and the one-brake enable state by rotating back and forth with the connecting arm shaft in the vertical direction as a fulcrum. Since the structure of the mechanism is simple, the assembly work is facilitated and the maintainability is also improved.

According to the one in which the regulating portion for restricting the rearward rotation range of the connecting arm is formed on the outer peripheral surface side of the brake pedal shaft, the regulating portion is arranged in the vicinity of the connecting arm. Since the movable range of the connecting arm becomes narrower, workability during assembly is further improved.

Further, a support bracket is arranged on the brake pedal shaft side, the connecting arm is supported on the support bracket side, and the support bracket is formed with a regulating portion that regulates the forward rotation range of the connecting arm. According to the case where the rotation range of the connecting arm is defined by sandwiching the connecting arm by the front and rear regulating parts, it is not necessary to separately provide a member for the regulating part, so that the number of parts is reduced and the cost is reduced. It can be kept low.

Further, an operating tool for operating the switching between the one-side brake prevention state and the one-side brake enable state by the connection arm is provided, and the connection arm shaft is arranged near the brake pedal located on the left and right inside, and the connection arm According to the one in which the wire is connected to the left and right inside of the connecting arm shaft and the connecting arm and the operating tool are connected by a linking mechanism including the wire, the wire is moved back and forth according to the operating direction of the connecting arm that operates back and forth. Since the wires can be arranged in the direction, the configuration of the linkage mechanism can be simplified.

According to the case where the connecting arm is mounted and supported so as to be rotatable back and forth by the connecting arm shaft, the mounting portion is formed in a cube shape and the mounting portion is fixed to the brake pedal side on one of the left and right sides. Assembling accuracy is improved, and labor during assembly work is reduced.

Further, on the brake pedal shaft side of at least one brake pedal, a connected arm that swings up and down integrally with the arm portion with the brake pedal shaft as a fulcrum is provided in a state of protruding rearward, and the connected arm is provided. The arm is targeted for connection / disconnection by the switching mechanism, and is provided with a cover body that covers the lower part of the connected arm and the switching tool, and the cover body holds deposits adhering to the side surface of the connected arm. According to the one having the scraper portion to be scraped off, since the cover body covering the entire lower part of the switching mechanism also serves as the scraper portion, the number of parts can be reduced and the cost can be kept low.

Further, if the switching mechanism is centrally arranged on one side of the left and right brake pedals, the assembling work becomes easier.

It is a side view of the tractor to which this invention is applied. It is the main part perspective view which showed the control part. It is a main part perspective view which showed the structure of the switching mechanism. It is a right rear perspective view which showed the switching mechanism. It is a left rear perspective view which showed the switching mechanism. It is the bottom rear perspective view which showed the switching mechanism. It is the right side side upper perspective view which showed the switching mechanism. It is the right side side lower perspective view which showed the switching mechanism. It is an exploded view of a switching mechanism. (A) to (D) are a plan view, a perspective view, a rear view, and a side view showing the configurations of the left and right brake pedals.

FIG. 1 is a side view of a tractor to which the present invention is applied, FIG. 2 is a perspective view of a main part showing a control part, and FIG. 3 is a perspective view of a main part showing a configuration of a brake operation unit. .. This tractor includes an airframe frame 3 supported by a pair of left and right front wheels 1 and 1 and rear wheels 2 and 2 which are drive wheels, and a bonnet 4 that covers the upper surface side of an engine installed on the front side of the airframe frame 3. A traveling machine 7 including a control unit 6 arranged behind the bonnet 4 and operated by an operator or the like is configured, and the rear side of the traveling machine 7 is a rotary cultivator via an elevating link 8. Work machines (not shown) such as, etc. can be connected so as to be able to move up and down.

The power of the drive wheels 2 is transmitted from the mission case to the left and right rear wheels 2 and 2 via a rear axle case (not shown). The rear axle case includes a left brake mechanism (not shown) that brakes the left rear wheel 2 and a right brake mechanism (not shown) that brakes the right rear wheel 2. The left and right brake mechanisms are By braking the drive wheels 2 on the inside of the turn during work running, it is possible to make a small turn.

The control unit 6 includes a seat 9 on which the operator sits, a steering handle 11 which is a steering steering wheel arranged on the front side of the seat 9, and a floor step 12 which is a floor surface on the lower side of the steering handle 11. On the floor step 12 side, a plurality of pedal operating tools operated by an operator seated in the seat 9 are provided.

The pedal operating tool is arranged on one of the left and right sides (right side in the illustrated example), and is located on the left and right other side (left side in the illustrated example) and the brake operating unit 15 for operating the braking of the left and right drive wheels 2 and 2. A clutch pedal 16 that is arranged and performs an intermittent operation of power transmitted from the engine side is provided.

The brake operation unit 15 has a left brake pedal 14L that brakes the left drive wheel 2 and a right brake pedal 14R that brakes the right drive wheel 2. The left and right brakes are driven by a switching mechanism 20 described later. It is configured to be switchable between a one-brake prevention state in which the pedals 14L and 14R are simultaneously stepped on and a one-brake enable state in which the left and right brake pedals 14 are disconnected and can be stepped on separately.

Further, on the left and right inside of the clutch pedal, a switching operation tool (operation tool) 17 for operating the switching between the one-brake prevention state and the one-brake possible state is provided via the switching mechanism 20 ( (See Fig. 2).

Further, on the upper side of the switching operation tool 17, a one-sided brake lever 18 that can switch to a state in which the brake pedal 14 on one of the left and right sides is depressed by operating the one-sided brake is provided. A parking brake lever 19 is provided on the right side of the lever 18 so that the left and right brake pedals 14 can be integrally depressed and operated.

Next, the brake operation unit 15 will be described with reference to FIGS. 2 and 3. FIG. 3 is a perspective view of a main part showing the configuration of the brake operation unit. The brake operation unit 15 includes a pair of left and right brake pedals 14L and 14R, a switching mechanism 20 for connecting and disconnecting the pair of brake pedals, and a drive wheel 2 on the corresponding side by depressing the brake pedal 14. It is equipped with a linking mechanism that links to operate braking.

The brake pedals 14L and 14R have a boss-shaped base end portion 22 that is inserted and supported by a brake pedal shaft that extends in the left-right direction, and extends forward from the base end portion 22 and upward from the middle portion. It is composed of a pedal arm 23 bent so as to extend to the side and a pedal body portion 24 integrally installed on the tip side of the pedal arm 23, and is vertically moved up and down on the right end side of the brake pedal shaft 21. It is supported so that it can swing.

On the upper surface side of each base end portion 22, 22, a swing piece 22a extending upward is provided, and each swing piece 22a, 22a is provided with a compression spring 26, which urges the rear side. One end side of 26 is locked. As a result, the left and right brake pedals 14L and 14R are held in non-operating positions where the braking operation of the pair of drive wheels 2 swung upward is not executed.

The brake pedal 14 having this configuration is configured so that the left and right drive wheels 2 are brake-operated when the pedal body 24 is stepped on against the urging force of the compression spring 26. Since the pedal body 24 and the upper end side of the pedal arm 23 are arranged on the lower side of the floor step 12, the space on the pedal operating tool side of the control unit 6 can be increased.

The linkage mechanism includes a left brake linkage mechanism 28 that operates the left brake mechanism by depressing the left brake pedal 14L, and a right brake linkage mechanism 27 that activates the brake mechanism by depressing the right brake pedal 14R. , The drive wheel 2 on the corresponding side can be braked according to the depression operation of each brake pedal.

The right brake linking mechanism 27 has a linking piece 29 projecting upward alongside the swinging piece on the right end side of the base end portion 22 of the right brake pedal 14R, and a front end side connected to the linking piece 29 in the front-rear direction. The right brake mechanism is operated via a linking rod 30 that is pushed and pulled.

The left brake linking mechanism 28 has a linking piece 10 that projects upward on the left end side of the brake pedal shaft 21 and rotates integrally with the base end portion 22 of the left brake pedal 14L, and the front end side is connected to the linking piece 10. The left brake mechanism is operated via a linking rod 25 that is pushed and pulled in the front-rear direction.

Further, on the rear side of the base end portion 22 of the brake pedal 14, a switching mechanism 20 is provided for switching the left and right brake pedals 14 between a one-brake prevention state and a one-brake possible state by the switching operation tool 17. Hereinafter, a specific configuration of the switching mechanism 20 will be described.

Next, the switching mechanism 20 will be described with reference to FIGS. 4 to 10. 4 to 6 are a right rear perspective view, a left rear perspective view, and a bottom rear perspective view showing the switching mechanism, and FIGS. 7 and 8 are side perspective views showing the switching mechanism, and FIG. 9 is a side perspective view showing the switching mechanism. 10 (A) to 10 (D) are exploded views of the switching mechanism, which are a plan view, a perspective view, a rear view, and a side view showing the configurations of the left and right brake pedals.

The switching mechanism 20 is integrated with the support plate 31 extending rearward from the rear side of the base end portion 22 of the left brake pedal 14L and the left and right outer surfaces (right side in the illustrated example) of the support plate 31. From the cube-shaped (cubic) support 32 fixed to the support 32, the connecting arm (switching tool) 33 supported by the support 32 so as to swing back and forth, and the rear side of the base end 22 of the right brake pedal 14R. A connected piece 34 having a recess 34a extending toward the rear and swinging forward to open the rear, and a cover body 36 covering the lower side of the connecting arm 33 are provided.

The connecting arm 33 has a shaft portion 33a that serves as a shaft when swinging back and forth, and a connecting portion 33b that extends to the left and right outside (right side) of the shaft portion and is inserted and removed from the recess 34a of the connected piece 34. And a rod-shaped operation piece 33c that is formed so as to project upward at a portion extending on the left and right inside (left side) of the shaft portion 33a, and can swing back and forth through the insertion hole formed in the support 32. It is installed (see FIG. 3). As a result, the connecting arm 33 is configured to swing back and forth on the rear side of the brake pedal shaft 21.

One end side of the compression spring 37 is locked to the lower side of the operation piece 33c, and the other end side of the compression spring 37 is locked to a locking pin 38 provided on the rear end side of the support plate 31. .. By the urging force of the compression spring 37, the connecting portion 33b side of the connecting arm 33 is urged toward the connecting position side located in the recess 34a. As a result, when the connecting portion 33b is swung to the connecting position, the connecting arm 33 and the connected piece 34 come into contact with each other when the brake pedal 14 is depressed, so that the left and right brake pedals 14L and 14R are always depressed at the same time. One-sided brake prevention state.

On the other hand, an operation wire (wire) 39 arranged forward is connected to the upper side of the operation piece 33c. The operating wire 39 is pulled forward by the switching operating tool 17 against the urging force of the compression spring 37, so that the connecting portion 33b side of the connecting arm 33 is disengaged from the recess 34a. It is configured so that it can be swung backward. As a result, when the connecting portion 33b is operated to the disengagement position via the operation wire 39, the left and right brake pedals 14L and 14R are disengaged, and one-sided braking is possible, which can be individually stepped on. Become.

In the connecting arm 33 having the above configuration, the support 32 on which the shaft portion 33a is provided is between the base end portion 22 of the left brake pedal 14L and the base end portion 22 of the right brake pedal 14R and is near the rear. Since the connection arm 33 is arranged, the movable range due to the forward / backward swing of the connecting arm 33 can be reduced, so that the entire switching mechanism 20 can be configured more simply and compactly (see FIG. 3).

By the way, the rear side of the base end portion 22 on the left brake pedal 14L side is regulated to regulate the movable range on the side where the connecting arm 33 swings backward by contacting the side opposite to the connecting portion 33b of the connecting arm 33. The portion 22b is formed, and the rear side of the support plate 31 is in contact with the side opposite to the connecting portion 33b of the connecting arm 33 to regulate the movable range on the side where the connecting arm 33 swings forward. Is formed.

That is, by forming a pair of front and rear restricting portions 22b and 31a for setting a range in which the connecting arm 33 can swing back and forth, the base end portion 22 of the left brake pedal 14L and the support plate 31 form the regulating portion. Since it is not necessary to provide dedicated parts for forming the 22a and 31a, the number of parts can be reduced and the cost can be kept low.

The operation wire 39 includes an outer wire 41 that is attached and fixed to the machine body side and an inner wire 42 that is inserted into the outer wire 41, and is configured so that the switching operation tool 17 and the connecting arm 33 can be linked. The end of the outer wire 41 on the connecting arm 33 side is attached and fixed to an L-shaped support piece 43 projecting forward from the front side of the base end 22 on the left brake pedal 14L side (FIG. 4). Etc.), the end of the outer wire 41 on the switching operation tool 17 side is attached and fixed to the traveling machine body side in the vicinity of the switching operation tool 17 (not shown).

That is, the switching operation tool 17 is configured to be able to swing up and down, and when the switching operation tool 17 is operated downward, the operation wire is pulled forward, so that the left and right brake pedals are moved. When the switch is switched to the one-brake prevention state in which the stepping operation is performed at the same time and the switching operation tool is operated upward, the operation wire does not pull the connecting arm, so that the left and right brake pedals can be stepped on separately. It is switched to the state.

Since the support 32 is formed in a cube shape and the connecting plate 33 is configured to swing back and forth on the upper surface side thereof, the back and forth swing of the connecting plate 33 is more stable and the support 32 side. Assembling work of the connecting plate 33 to and maintenance work can be performed smoothly.

Further, the support 32 is integrally fixed to the support plate 31 side, so that the base end portion 22 of the left brake pedal 14L, the support plate 31, and the support 32 are integrally configured. Therefore, the assembling work is facilitated, and the assembling accuracy and strength are also improved.

The cover body 34 has a left wall portion 34a in which both left and right ends of the plate-shaped member are bent upward and a right wall portion 34b, and is formed in a U shape with the upper and front-rear directions open. The left wall portion 34a side is configured to be bolt-fixable to the support plate side (see FIG. 3 and the like). Further, on the left wall portion 34a side, a notch portion 34c is formed so as to avoid the inclined piece 35 formed so as to incline rearward from the base end portion 22 side of the left brake pedal 14 toward the left surface side of the support plate 31. Has been done.

According to the configuration, the cover body 34 can prevent the left and right sides of the switching mechanism 20 from being soiled with mud, and the front of the switching mechanism 20 is covered with the base end portions 22 of the left and right brake pedals 14L and 14R. As a result, it is possible to prevent the adhesion of mud in the field, so that it is possible to prevent the connecting arm 33 from becoming sluggish due to the adhesion of mud. Further, since the front and rear of the cover body 34 are opened, the mud can be easily scraped out even when the mud adheres to the inside of the cover body 34, so that the maintainability such as cleaning is improved.

Further, the cover body 34 is a scraper in which the upper side of the left wall portion 34a and the right wall portion 34b formed so as to rise upward scoops mud adhering to the base end portions of the left and right brake pedals 14L and 14R. Also works as. From the above, the cover body 34 can obtain a sufficient effect of avoiding mud with a simple structure and also functions as a scraper, so that the number of parts can be reduced and the cost can be suppressed to a lower level.

2 Rear wheel (running part)
12 Floor step 14 Brake pedal 15 Brake operation unit (brake device)
17 Switching operation tool (operation tool)
20 Switching mechanism 21 Brake pedal shaft 22 Base end 22b Restriction 23 Pedal arm (arm)
24 Pedal body 31 Support plate (support bracket)
33a Shaft (connecting arm shaft)
33 Connecting arm 31a Restricting part 32 Support (mounting part)
34 Connected piece (connected arm)
36 cover body

Claims (5)

It is a work vehicle capable of one-sided braking operation in which braking force is applied to only one of the left and right traveling parts (2, 2).
It is supported so as to be swingable up and down with the brake pedal shaft (21) in the left-right direction arranged below the floor step (12) as a fulcrum, and is forward from the base end portion (22) on the brake pedal shaft (21) side. Further, an arm portion (23) that is formed so as to project upward and whose tip portion is located above the floor step (12) and a pedal body portion (24) that is integrally installed at the tip portion of the arm portion (23). A pair of left and right brake pedals (14L, 14R) with
By operating the brake pedals (14) on one of the left and right sides, a braking force is applied to the traveling portion (2) on one of the left and right sides, and by operating the brake pedals (14) on the other side of the left and right, the traveling portions on the other left and right sides ( A braking device (15) that exerts a braking force on 2) and
The one-side brake prevention state in which the left and right brake pedals (14) are integrally operated by connecting the left and right brake pedals (14), and the one-side brake prevention state in which the left and right brake pedals (14) are disconnected by disconnecting the left and right brake pedals (14). It is equipped with a switching mechanism (20) that switches between the left and right brake pedals (14) that can be operated separately and one brake is possible.
The switching mechanism (20) is arranged directly behind the brake pedal shaft (21) .
The switching mechanism (20) has a connecting arm (33) that switches between the one-brake prevention state and the one-brake enable state by rotating back and forth with the connecting arm shaft (33a) in the vertical direction as a fulcrum.
A work vehicle in which a regulating portion (22b) for restricting a rearward rotation range of the connecting arm (33) is formed on the outer peripheral surface side of the brake pedal shaft (21) . It is a work vehicle capable of one-sided braking operation in which braking force is applied to only one of the left and right traveling parts (2, 2).
It is supported so as to be swingable up and down with the brake pedal shaft (21) in the left-right direction arranged below the floor step (12) as a fulcrum, and is forward from the base end portion (22) on the brake pedal shaft (21) side. Further, an arm portion (23) that is formed so as to project upward and whose tip portion is located above the floor step (12) and a pedal body portion (24) that is integrally installed at the tip portion of the arm portion (23). A pair of left and right brake pedals (14L, 14R) with
By operating the brake pedals (14) on one of the left and right sides, a braking force is applied to the traveling portion (2) on one of the left and right sides, and by operating the brake pedals (14) on the other side of the left and right, the traveling portions on the other left and right sides ( A braking device (15) that exerts a braking force on 2) and
The one-side brake prevention state in which the left and right brake pedals (14) are integrally operated by connecting the left and right brake pedals (14), and the one-side brake prevention state in which the left and right brake pedals (14) are disconnected by disconnecting the left and right brake pedals (14). It is equipped with a switching mechanism (20) that switches between the left and right brake pedals (14) that can be operated separately and one brake is possible.
The switching mechanism (20) is arranged directly behind the brake pedal shaft (21) .
The switching mechanism (20) has a connecting arm (33) that switches between the one-brake prevention state and the one-brake enable state by rotating back and forth with the connecting arm shaft (33a) in the vertical direction as a fulcrum.
An operating tool (17) for operating the switching between the one-brake prevention state and the one-brake enable state by the connecting arm (33) is provided.
The connecting arm shaft (33a) is arranged closer to the brake pedal (14L) located on the left and right inside.
A wire (39) is connected to the left and right inside of the connecting arm shaft (33a) in the connecting arm (33).
A work vehicle in which the connecting arm (33) and the operating tool (17) are connected by a linking mechanism including the wire (39) . It is a work vehicle capable of one-sided braking operation in which braking force is applied to only one of the left and right traveling parts (2, 2).
It is supported so as to be swingable up and down with the brake pedal shaft (21) in the left-right direction arranged below the floor step (12) as a fulcrum, and is forward from the base end portion (22) on the brake pedal shaft (21) side. Further, an arm portion (23) that is formed so as to project upward and whose tip portion is located above the floor step (12) and a pedal body portion (24) that is integrally installed at the tip portion of the arm portion (23). A pair of left and right brake pedals (14L, 14R) with
By operating the brake pedals (14) on one of the left and right sides, a braking force is applied to the traveling portion (2) on one of the left and right sides, and by operating the brake pedals (14) on the other side of the left and right, the traveling portions on the other left and right sides ( A braking device (15) that exerts a braking force on 2) and
The one-side brake prevention state in which the left and right brake pedals (14) are integrally operated by connecting the left and right brake pedals (14), and the one-side brake prevention state in which the left and right brake pedals (14) are disconnected by disconnecting the left and right brake pedals (14). It is equipped with a switching mechanism (20) that switches between the left and right brake pedals (14) that can be operated separately and one brake is possible.
The switching mechanism (20) is arranged directly behind the brake pedal shaft (21).
Said switching mechanism (20) have a vertical connecting arm axis of the connecting arm (33) which by back-and-forth rotation with the fulcrum (33a) for switching between said piece brake state to the said piece brake lock state,
The mounting portion (32) to which the connecting arm (33) is mounted and supported so as to be rotatable back and forth by the connecting arm shaft (33a) is formed into a cube shape.
A work vehicle in which the mounting portion (32) is fixed to the brake pedal (14L) side on one of the left and right sides . It is a work vehicle capable of one-sided braking operation in which braking force is applied to only one of the left and right traveling parts (2, 2).
It is supported so as to be swingable up and down with the brake pedal shaft (21) in the left-right direction arranged below the floor step (12) as a fulcrum, and is forward from the base end portion (22) on the brake pedal shaft (21) side. Further, an arm portion (23) that is formed so as to project upward and whose tip portion is located above the floor step (12) and a pedal body portion (24) that is integrally installed at the tip portion of the arm portion (23). A pair of left and right brake pedals (14L, 14R) with
By operating the brake pedals (14) on one of the left and right sides, a braking force is applied to the traveling portion (2) on one of the left and right sides, and by operating the brake pedals (14) on the other side of the left and right, the traveling portions on the other left and right sides ( A braking device (15) that exerts a braking force on 2) and
The one-side brake prevention state in which the left and right brake pedals (14) are integrally operated by connecting the left and right brake pedals (14), and the one-side brake prevention state in which the left and right brake pedals (14) are disconnected by disconnecting the left and right brake pedals (14). It is equipped with a switching mechanism (20) that switches between the left and right brake pedals (14) that can be operated separately and one brake is possible.
The switching mechanism (20) is arranged directly behind the brake pedal shaft (21).
The switching mechanism (20) has a connecting arm (33) that switches between the one-brake prevention state and the one-brake enable state by rotating back and forth with the connecting arm shaft (33a) in the vertical direction as a fulcrum.
On the brake pedal shaft (21) side of at least one brake pedal (14R), a connected arm (34) that swings up and down integrally with the arm portion (23) with the brake pedal shaft (21) as a fulcrum is provided. , Provided in a state of protruding rearward,
The connected arm (34) is a target of connection / disconnection by the switching mechanism (20).
A cover body (36) that covers the lower part of the connected arm (34) and the switching mechanism (20) is provided.
The cover body (36) is a work vehicle having a scraper portion for scraping off deposits adhering to the side surface of the connected arm (34) . The work vehicle according to any one of claims 1 to 4, wherein the switching mechanism (20) is centrally arranged on one side of the left and right brake pedals (14L, 14R) .

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