JP2020124939A - Working machine - Google Patents

Abstract

To provide a working machine that has steps that do not cause deterioration in strength, without deteriorating effectiveness of using the plurality of divided steps.SOLUTION: The working machine comprises steps 26 arranged below a driver seat and supported on a machine frame to be placed on the machine frame, where the driver seat is supported on the machine frame having front wheels and rear wheels. The steps 26 have a plurality of divided steps and comprise, in the machine frame, boundary frames 23e arranged along division lines X acting as boundaries for the divided steps to support the divided steps.SELECTED DRAWING: Figure 8

Description

The present invention relates to a work machine including a driver's seat and steps.

As a work machine having the above structure, Patent Document 1 describes a step having a structure in which a main step floor is arranged in the center in the lower front of the driver's seat and sub step floors are arranged on both sides of the main step floor.

Further, in Patent Document 1, a floor support frame that supports a main step floor and sub-step floors at left and right positions of the main step floor from below is provided for the floor support frame that is supported by the vehicle body frame. Is listed.

JP, 2007-228975, A

Here, assuming that the step is formed by molding a resin, it is possible to realize a good surface that can be reduced in weight without causing corrosion due to rust.

Further, considering the handling of the steps when assembling the working machine, it is desirable that the steps be divided into a plurality of steps to be downsized. Further, even when the step needs to be replaced, such as when the step is damaged, it is desirable that the step be divided into a plurality of steps in order to facilitate the replacement.

However, in the case where a plurality of members are simply arranged to form a step, it is considered that the strength near the boundary between the members is lowered.

For these reasons, there is a demand for a working machine that has steps that do not reduce the strength without impairing the effectiveness of using a plurality of division steps.

A feature structure of a working machine according to the present invention is a machine frame having front wheels and rear wheels, a driver's seat supported by the machine frame, a driver's seat disposed below the driver's seat, and mounted on the machine frame. A state of being supported by the body frame in a state, the step comprising a plurality of dividing steps, and the boundary supporting the dividing steps by being arranged along a dividing line serving as a boundary of the dividing steps. A frame is provided on the body frame.

According to this characteristic configuration, by using the plurality of resin divided frames, the workability is good when the working machine is assembled, and the steps are easily assembled. In addition, a plurality of division steps can be configured to be mounted on the machine body frame, and at least one of the division steps can be firmly supported by the boundary frame arranged along the division line of the boundary between the adjacent division steps. In particular, in this configuration, by using the boundary frame, for example, it is not necessary to increase the resin thickness in the dividing step in order to increase the strength.
Therefore, a working machine having steps in which the strength is not reduced without impairing the effectiveness of using the plurality of division steps is configured.

As another configuration, the machine body frame includes a step frame, and a plurality of protrusions protruding downward are formed on a lower surface of the division step so as to abut on upper surfaces of the step frame and the boundary frame. May be done.

The step frame and the boundary frame are formed by a rod-shaped member.For example, in the case where the step is made of a flat resin plate, the contact area when the step of this structure is placed on the step frame or the boundary frame. It was also considered that the load was narrow and the elastic load was concentrated, resulting in elastic deformation. On the other hand, according to this configuration, the protrusion formed on the lower surface of the step comes into contact with the upper surface of the step frame or the boundary frame to disperse the pressure acting from these to the step, thereby eliminating the concentration of the load. Elastic deformation can be suppressed.

As another configuration, as the dividing step, a main step arranged below the driver's seat and a front step arranged in front of the driver's seat are provided, and between the main step and the front step. The division line may be formed in a horizontal posture.

According to this, since a horizontal dividing line is formed between the main step located below the driver's seat and the front step in front of this, a horizontal bar-shaped member is used as a boundary along this dividing line. It becomes possible to construct a frame. Here, when considering a configuration in which rod-shaped members are arranged vertically and horizontally as a step frame that supports steps, for example, as compared with an object in which the rod frame is in an oblique posture in plan view with respect to the front-back direction of the body, the boundary frame has a horizontally long rod-like shape. There is no difficulty in arranging what is made up of members.

It is a side view of the whole rice transplanter. It is a top view of the whole rice transplanter. It is a perspective view of a machine body frame. It is a side view of a suspension unit. It is a top view of a suspension unit. It is a front view which shows arrangement|positioning of a suspension spring. It is a rear view which shows a lateral link. It is a top view showing a main step and a front step. It is a perspective view showing a main step, a front step, and a bottom surface. It is sectional drawing of a main step, a front step, and a boundary frame. It is sectional drawing of the outer edge part of a boundary frame, and a step. It is sectional drawing of an auxiliary frame and a step.

Embodiments of the present invention will be described below with reference to the drawings.
[Overall structure of riding type rice transplanter]
1 and 2 show the entire riding-type rice transplanter A as an example of a working machine. This rice transplanter A has a pair of left and right front wheels 1 and a pair of left and right rear wheels 2, and a rear part of a body T that can travel. Support.

In this rice transplanter, a steering wheel 6 for steering and operating the front wheels 1 and a driver's seat 7 are provided at a central position of the machine body T, an elevating lever 8 is provided on a right side portion of the steering wheel 6, and a left side portion of the steering wheel 6 is provided. Is equipped with a main shift lever 9.

The seedling planting device U lowers the seedling planting device U to a position where it contacts the field by operating the elevating lever 8, sets the traveling speed of the main shift lever 9, and operates the elevating lever 8 to set the planting clutch ( By operating (not shown), the seedling planting device U is driven to enable seedling transplanting work to a field scene.

In the front-rear direction and the left-right direction in the embodiment of the present invention, "F" in the drawings is the front side of the machine body T, and "B" is the rear side of the machine body T unless otherwise specified. Further, “L” shown in the drawing is the left side of the airframe T, and “R” is the right side.

[Transmission configuration]
In this rice transplanter A, as shown in FIG. 1, an engine 11 and an engine hood 12 that covers the engine 11 are arranged at the front of a machine body T. Further, a mission case 13 is arranged below the engine 11 in the front part of the machine body T, and a rear axle case 14 is arranged in the rear part of the machine body T.

As shown in FIGS. 1 and 4, a traveling transmission shaft 15 that transmits traveling driving force from the transmission case 13 to the rear axle case 14 is provided. A work transmission shaft 16 for transmitting a work driving force from the mission case 13 to the seedling planting device U is provided.

Further, a belt tension type clutch mechanism 17 is provided on the left side surface of the engine 11, and a continuously variable transmission 18 is provided which continuously changes the driving force from the clutch mechanism 17 and transmits it to the transmission case 13. The continuously variable transmission 18 continuously changes the driving force transmitted to the transmission case 13 in cooperation with the operation of the main transmission lever 9.

The mission case 13 has a built-in differential gear (not shown) for transmitting the traveling drive force to the left and right front wheels 1, and a drive system for transmitting the traveling drive force to the traveling transmission shaft 15. Further, the mission case 13 has a built-in clutch (not shown) for connecting and disconnecting the work driving force transmitted to the work transmission shaft 16.

The rear axle case 14 has a built-in differential gear (not shown) that transmits the traveling drive force to the left and right rear wheels 2, and transmits the traveling drive force transmitted by the work transmission shaft 16 to the left and right rear wheels 2.

With such a configuration, by operating the main shift lever 9, a driving force having a driving speed corresponding to the operating position is transmitted to the mission case 13, and the front wheels 1 and the rear wheels 2 are synchronously driven at this driving speed. .. As a result of this driving, traveling of the machine body T is realized.

In this rice transplanter A, the hydraulic cylinder 3 is operated by operating the lifting lever 8 so that the seedling planting device U can be lifted and lowered. Further, when the planting clutch is in the engaged state when the seedling planting device U is raised, the planting clutch is disengaged.

On the contrary, the hydraulic cylinder 3 is operated by operating the lifting lever 8 to lower the seedling planting device U to a level at which the planting plant is grounded, and the lifting lever 8 is operated in this lowered state to plant the clutch. The operation of entering the plant is performed, and the work of planting seedlings becomes possible.

(Airframe configuration: Airframe frame)
The machine body T shown in FIGS. 1 and 2 includes a machine body frame 20 shown in FIG. The machine body frame 20 includes a pair of left and right main frames 21 arranged in the center of the machine body T in the left-right direction, and also includes an engine support frame 22, a step frame 23, a rear bracket 24, and a rear support frame 25. ing.

The engine support frame 22 is arranged on the front side of the main frame 21, and the engine 11 is supported by the engine support frame 22. As shown in FIG. 1, the mission case 13 is arranged between the front end portion of the main frame 21 and the engine support frame 22, and the mission case 13 is supported in such a manner as to be connected thereto.

As shown in FIG. 3 and FIG. 8, the step frame 23 is arranged in a region that horizontally projects from the main frame 21. A step 26 made of resin is supported on the step frame 23 in a mounted manner. The step 26 is disposed below the driver's seat 7 and is provided in a horizontal posture so that an operator can board the vehicle.

As shown in FIG. 3, the rear bracket 24 is erected on the rear end of the main frame 21, and the rear support frame 25 is connected to the rear upper end of the rear bracket 24 in a horizontally long posture. The rear end portions of the left and right second frames 23b forming the step frame 23 are bent so as to be lifted upward, and both ends of the rear support frame 25 are connected to the rear end portions. Further, the resin fender 27 is supported in a form of being mounted on the region extending from the rear end portion of the step frame 23 to the rear support frame 25.

As shown in FIGS. 1 and 3, the driver's seat 7 is supported by a seat frame 28 connected to the upper end of the rear bracket 24. The front end of the link mechanism 4 is supported by the rear bracket 24.

(Airframe configuration: Suspension unit)
In this rice transplanter A, the rear axle case 14 is supported below the rear end of the main frame 21 via a suspension unit. As shown in FIGS. 4 to 7, the suspension unit includes a pair of left and right suspension springs 31, a pair of left and right suspension links 32, and a single lateral link 33.

That is, the suspension frame 35 that penetrates the main frame 21 above the rear axle case 14 in the left-right direction is provided, and the upper spring support portions 36 are provided on the lower surfaces of both outer ends of the suspension frame 35. A lower spring support portion 37 is arranged immediately below this, and the lower spring support portion 37 is swung by a swing support shaft 38a in a horizontal posture (horizontally long posture) with respect to a spring support bracket 38 on the front surface of the rear axle case 14. It is supported freely.

A compression coil type suspension spring 31 is provided so as to be sandwiched between the upper spring support portion 36 and the lower spring support portion 37.

As for the left and right suspension links 32, as shown in FIGS. 5 and 6, a swelling frame 32b is fixed inside the plate-shaped main link 32a arranged on the outside (center side of the machine body), and the boss portion 40 is provided at the front end. And a connecting portion 41 is formed at the rear end. The boss portion 40 is connected to each of the main link 32a and the bulging frame 32b. The connecting portion 41 is configured as a connecting wall having a constant width in the lateral direction at the rear end position of the main link 32a.

As shown in FIGS. 4 and 5, each of the left and right main frames 21 is provided with a fulcrum bracket 42 formed of a pair of plates. Further, a plurality of screw holes (female screw holes) are formed in the front surface of the rear axle case 14 at positions symmetrical with respect to the center in the left-right direction.

With such a configuration, the boss portions 40 at the front ends of the left and right suspension links 32 are arranged between the pair of plates of the corresponding fulcrum bracket 42, and are rotatably supported by the fulcrum bolts 43. Further, the connecting bolts 44, which are inserted from the front side into the through holes formed in the connecting portions 41 at the rear ends of the left and right suspension links 32, are screwed into the screw holes of the rear axle case 14 so that the rear ends of the suspension links 32 are rearward. It is fixed to the axle case 14.

A rubber bush is provided on the inner periphery of the insertion hole of the boss portion 40 of the suspension link 32, and the fulcrum bolt 43 is arranged so as to pass through the rubber bush. In particular, the suspension link 32 obtains high strength by superimposing the main link 32a and the bulging frame 32b.

The lateral link 33 is made of a band plate material having boss shafts 33a formed at both ends in the longitudinal direction. The lateral link 33 is arranged behind the rear axle case 14 in such a positional relationship that the center position corresponds to the center position of the rear axle case 14 in the left-right direction.

A first link bolt 46, which is inserted in one of the lateral links 33 (right side in the embodiment) in the front-back direction, is supported on the rear surface of the rear axle case 14. In addition, a second link bolt 47 that is inserted in the other side (the left side in the embodiment) of the lateral link 33 in the front-back direction is supported by the lower end of the fixed bracket 48.

The fixed bracket 48 is a vertically long member whose upper end is connected to the machine body frame 20, and one end of the auxiliary bracket 49 is connected to the lower end of the fixed bracket 48 by the second link bolt 47. The other end of the auxiliary bracket 49 is connected to the main frame 21.

In particular, this lateral link 33 is provided with a rubber bush on the inner periphery of the pair of boss shafts 33a, and the first link bolt 46 and the second link bolt 47 insert the rubber bush. As a result, the lateral link 33 is swingably supported by the rear axle case 14 and the fixed bracket 48.

(Construction of aircraft: spare seedling stand)
As shown in FIG. 1 and FIG. 2, the preliminary seedling mounts 55 are arranged on both sides of the front portion of the machine body T in the left-right direction. The preliminary seedling placing table 55 is arranged in a shelf shape for placing mat-like seedlings used for planting by the seedling planting device U.

The left and right spare seedling mounting bases 55 are provided on the upper ends of the column-shaped frames 56 in the vertical postures, respectively. As shown in FIGS. 1, 3, and 8, the aircraft T is provided with a horizontal frame 58 in a horizontal posture (horizontally long posture) that supports the lower ends of the respective pillar-shaped frames 56 via a support case 57.

The horizontal frame 58 is arranged below the step 26, and an intermediate portion thereof penetrates the engine support frame 22 in the left-right direction, and is welded and fixed to the engine support frame 22 at this penetration portion.

The support case 57 is fixed to the outer end of the horizontal frame 58, and the base end portion of the columnar frame 56 is swingably supported by the support case 57. This swinging enables the preliminary seedling stand 55 to move in the front-rear direction.

Further, as shown in FIG. 3, the outer end position of the horizontal frame 58 is supported by the outer end support portion K in a state of being suspended below the step frame 23. The outer end support portion K connects the first bracket 59 provided on the upper surface at the outer end position of the horizontal frame 58 and the second bracket 60 provided on the lower surface of the fifth frame 23f (step frame 23) to the intermediate bolt 61. (An example of a screw).

With such a structure of the outer end support K, by connecting the first bracket 59 and the second bracket 60 with the intermediate bolt 61, downward bending of both end portions of the horizontal frame 58 is suppressed, and the preliminary seedling mounting is performed. The position of the base 55 is stabilized. Further, in the outer end support portion K, by removing the intermediate bolt 61 and separating the first bracket 59 and the second bracket 60, maintenance of the outer end portion of the horizontal frame 58 can be easily performed.

[Step]
As shown in FIGS. 2 and 8, the step 26 is composed of a rear main step 26M (an example of a division step) and a front front step 26F (an example of a division step). The step frame 23 is supported by the step frame 23 so as to be adjacent to the step frame 26F in the front-back direction. The main step 26M is horizontally long in a plan view and has a shape that is almost rectangular as a whole. The front step 26F has front ends of side step regions arranged on the left and right of the engine bonnet 12 connected to each other, and a rear end of the side step region has a linear shape extending in the left-right direction of the machine body T.

In particular, a boundary line X is set between the front end of the main step 26M and the rear end of the front step 26F in a posture along the lateral direction of the machine body T.

As shown in FIGS. 3 and 8, the main frame 21 includes a boarding/alighting step frame 65 that penetrates the main frame 21 in the left-right direction. The boarding/alighting step frame 65 is arranged below the main step 26M, has both ends projecting outward from the main step 26M in plan view, and a boarding/alighting step 66 is provided at each part.

As shown in FIGS. 3 and 8, the step frame 23 is in a posture parallel to the main frame 21, and is a first frame 23a (a specific example of a rod-shaped member) arranged outside the main frame 21 and the first frame 23a. The second frame 23b (a specific example of a rod-shaped member) arranged along the outer periphery of the step 26 on the outer side.

Further, the step frame 23 includes a third frame 23c (a specific example of a rod-shaped member) that is in a posture along the lateral direction of the machine body T. Both ends of the third frame 23c are connected to the left and right first frames 23a. Further, the third frame 23c is supported by the corresponding left and right main frames 21 via the left and right first relay brackets 67. A band plate material is used for the first relay bracket 67, and the upper end is connected to the third frame 23c and the lower end is connected to the main frame 21.

A fourth frame 23d (a specific example of a rod-shaped member) that connects the first frame 23a and the second frame 23b is arranged at the front position and the rear position in a posture along the lateral direction of the machine body T. That is, the fourth frame 23d is arranged at four places, and the rear side of the fourth frame 23d is connected to the boarding/alighting step frame 65 via the reinforcing bracket 68.

The reinforcing bracket 68 is integrally formed with the fourth frame 23d at the upper end by bending a plate material. Further, the reinforcing bracket 68 has one end in the left-right direction of the upper end connected to the first frame 23a, the other end connected to the second frame 23b, and the lower end connected to the boarding/alighting step frame 65. ..

Further, in the step frame 23, a boundary frame 23e having a laterally long posture below the boundary part between the front end of the main step 26M and the front step 26F has a front end position of the first frame 23a and a second frame 23b. It is arranged at a position for connecting.

As shown in FIG. 8, the second frame 23b is arranged in an area extending over the main step 26M and the front step 26F, but the first frame 23a is arranged only below the main step 26M. It is a thing. The second frame 23b is not limited to a single member, but may be a combination of a plurality of members.

In order to support the front step 26F, a fifth frame 23f (a specific example of a rod-shaped member) is provided in a region extending from the left and right boundary frames 23e to the front side. The left and right fifth frames 23f are arranged in a region in front of the first frame 23a in the longitudinal direction.

As shown in FIGS. 3 and 8, the front ends of the left and right second frames 23b are bent inward corresponding to the front end portions of the machine body T. Due to this structure, the fifth frame 23f has its rear end connected to the boundary frame 23e and its front end connected to the second frame 23b.

[Step: Structure for reinforcement]
The main step 26M is made of resin, and the step frame 23 supporting the main step 26M is configured by vertically and horizontally combining the first frame 23a, the second frame 23b, the third frame 23c, and the fourth frame 23d. Therefore, it is also considered that the main step 26M elastically deforms in a portion that becomes an opening in a plan view.

In order to eliminate such an inconvenience, the main step 26M is supported by an opening portion surrounded by the front side of the third frame 23c and the insides of the left and right first frames 23a, and the downward displacement of the main step 26M is suppressed. Therefore, as shown in FIGS. 3 and 8, the step frame 23 includes left and right reinforcing frames 69.

A rod-shaped member is used for the pair of left and right reinforcing frames 69, and the distance between the front end portions of the left and right reinforcing frames 69 is set to be larger than the distance between the rear end portions. As a result, the left and right reinforcing frames 69 are arranged in a symmetrical posture with respect to the center of the machine body T in the left-right direction in plan view.

Further, a rod-shaped intermediate connecting frame 70 is provided in a horizontal posture (horizontally long posture) so as to connect intermediate portions of the left and right reinforcing frames 69. The intermediate connecting frame 70 has its lateral ends connected to the corresponding reinforcing frames 69 to improve the strength of the left and right reinforcing frames 69, thereby increasing the support strength of the main step 26M.

The intermediate connecting frame 70 is supported by the left and right main frames 21 by a pair of second relay brackets 71. A band plate material is used for the intermediate connection frame 70, the upper end is connected to the intermediate connection frame 70, and the lower end is connected to the main frame 21.

As shown in FIG. 8, the inside of the side step region of the front step 26F is formed into a shape that follows the outer surface of the engine bonnet 12. Further, as shown in FIGS. 3 and 8, the step frame 23 is provided with an auxiliary frame 72 using a long strip-shaped member in order to increase the support strength of a portion along the inside of the side step region of the front step 26F. ing.

The auxiliary frame 72 has one end connected to the fifth frame 23f and the other end connected to the front end portion of the main frame 21 via the third relay bracket 73 in a posture in which the width direction is directed vertically.

In particular, the respective shapes of the left and right auxiliary frames 72 are different in a plan view. That is, the left auxiliary frame 72 is formed so as to bulge outward so as to avoid contact with the pulleys and belts forming the clutch mechanism 17. Further, the right auxiliary frame 72 is formed in a shape that bulges outward so as to secure a space for arranging harnesses for controlling the engine 11.

[Step support structure]
As shown in FIGS. 8 and 9, a plurality of main protrusions 26MT are formed on the lower surface of the main step 26M. These main protrusions 26MT are the upper surfaces of the left and right first frames 23a, the left and right second frames 23b, the left and right boundary frames 23e, the left and right reinforcing brackets 68, the reinforcing frames 69, and the intermediate connecting frame 70. It is arranged at a position where it comes into contact with and projects downward.

These main protrusions 26MT have a cylindrical shape whose lower side opens downward. In particular, a part of the plurality of main protrusions 26MT includes an opening on the upper side and a bottom wall on the lower side, and a main bolt hole 26Mu formed in the bottom wall.

With such a configuration, as shown in FIGS. 8, 10, and 11, the fixing bolt 75 is inserted from the upper surface side of the main step 26M into the main bolt hole 26Mu of the main protrusion 26MT and screwed into the corresponding frame. By doing so, the main step 26M is fixed. That is, a bolt hole is formed in the step frame 23 at a position where the main bolt hole 26Mu overlaps, and the fixing bolt 75 is screwed into the bolt hole, and the main step 26M is supported by the step frame 23 in a tightened form.

In particular, of the step frame 23, the boundary frame 23e arranged along the boundary line X is arranged at a position that supports the front end portion of the main step 26M. That is, as shown in FIGS. 8 and 10, the rear end portion of the side region of the front step 26F is formed in a straight line shape along the lateral direction of the machine body T in a plan view, and along the linearly formed region. The front end portion of the main step 26M is formed on the. Since the main protrusion MT having the main bolt hole 26Mu is also formed at the front end portion, the main bolt M is inserted in the main bolt hole 26Mu and screwed into the bolt hole of the boundary frame 23e. It is fixed.

As shown in FIG. 9, a plurality of front protrusions 26FT are formed on the lower surface of the front step 26F. These front protrusions 26FT are arranged at positions contacting the upper surfaces of the left and right second frames 23b, the left and right fifth frames 23f, and the left and right reinforcing frames 69, and project downward.

The front protrusion 26FT has a cylindrical shape that opens downward, similar to the main protrusion 26MT described above. In particular, a part of the plurality of front protrusions 26FT has a bottom wall opened on the upper side and a bottom wall on the lower side, and a front bolt hole 26Fu is formed in this bottom wall.

With such a configuration, as shown in FIGS. 8, 10 and 11, the fixing bolt 75 is inserted from the upper surface side of the front step 26F into the front bolt hole 26Fu of the front protrusion 26FT and screwed into the corresponding frame. By doing so, the front step 26F is fixed. That is, a bolt hole is formed in the step frame 23 at a position where the front bolt hole 26Fu overlaps, and the fixing step 75 is screwed into the bolt hole and the front step 26F is supported by the step frame 23 in a tightened form.

Further, as shown in FIG. 12, since the upper surface of the auxiliary frame 72 is arranged at a position higher than the upper surfaces of the other step frames 23, the protruding amount of the auxiliary frame 72 among the plurality of front protrusions 26FT is reduced. ing.

[Operation and effect of the embodiment]
As described above, since the step 26 is formed by the main step 26M (an example of the dividing step) and the front step 26F (an example of the dividing step), the handling of the step 26 when assembling the rice transplanter (an example of the working machine) Good quality.

Further, a plurality of main protrusions 26MT are formed on the lower surface of the main step 26M, and a plurality of front protrusions 26FT are formed on the lower surface of the front step 26F, and these abut on the upper surface of the step frame 23 to step the load. 26, so that the elastic deformation of step 26 is suppressed.

Furthermore, since the boundary frame 23e made of a rod-shaped material is arranged along the boundary line X that is the boundary between the main step 26M and the front step 26F, at least one of the main step 26M and the front step 26F can be firmly supported. ..

[Another embodiment]
The present invention may be configured as follows in addition to the above-described embodiment (those having the same functions as those in the embodiment have the same numbers and reference numerals as those in the embodiment).

(A) The boundary frame is arranged at a position where the center in the width direction of the boundary frame 23e becomes the boundary line X. With this structure, the boundary frame 23e can support the front end of the main step 26M and the rear end of the front step 26F.

(B) The boundary frame 23e is arranged in front of the boundary line X. With this arrangement, the rear end position of the front step 26F can be supported with high strength.

(C) Step 26 is configured by arranging three or more members in a plane. Since the step 26 of the rice transplanter A is relatively large, the handleability at the time of assembling the rice transplanter A and at the time of maintenance is not good. On the other hand, by constructing the step 26 with three or more members, workability at the time of assembling the rice transplanter A and at the time of maintenance is improved.

(D) The protruding end (lower end) of the protrusion formed on the lower surface of the step 26 is formed into a shape that conforms to the shape of the upper surfaces of the plurality of rod-shaped members forming the step 26. For example, when the rod-shaped member forming step 26 has a circular cross section, the protruding end of the protruding portion is formed into a concave shape along the circle, and the step is performed on the rod-shaped member forming step 26. 26 can be stably supported.

INDUSTRIAL APPLICATION This invention can be utilized for the working machine provided with the driver's seat and steps.

1 Front Wheel 2 Rear Wheel 7 Driver Seat 20 Airframe Frame 23 Step Frame 23e Boundary Frame 26 Step 26F Front Step (Division Step)
26FT Front projection (projection)
26M main step (division step)
26MT Main projection (projection)
X division line

Claims (3)

A fuselage frame having front wheels and rear wheels;
A driver's seat supported by the aircraft frame,
Disposed below the driver's seat and supported by the machine frame in a state of being mounted on the machine frame,
A work machine in which the step comprises a plurality of division steps, and a boundary frame that supports the division steps by being arranged along a division line that is a boundary of the division steps is provided in the machine body frame. The body frame includes a step frame,
The working machine according to claim 1, wherein a plurality of protrusions protruding downward are formed on a lower surface of the dividing step so as to contact upper surfaces of the step frame and the boundary frame. As the dividing step, a main step arranged below the driver's seat and a front step arranged in front of the main step are provided.
The working machine according to claim 1 or 2, wherein the dividing line in a horizontal posture is formed between the main step and the front step.

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