JP2021195110A - Wheel structure of agricultural work machine - Google Patents

Abstract

To provide a wheel structure of an agricultural work machine which suppresses carrying-about of adhered mud by an outside wheel cap and an inside wheel cap and eliminates the fall of clods to a steering arm and so on when travelling in a muddy field, and can prevent trouble due to mud accumulation.SOLUTION: A wheel structure of an agricultural work machine comprises an outside wheel cap 21 which is detachably attached to a tire 20 of a spoke type wheel supported by a wheel support device 15 of a travel airframe 2 and covers an outer side face of a tire part 20a. In the wheel structure, an inside wheel cap 22, which covers a middle part side of a spoke 19 from an inner side face of the tire part 20a of the tire 20, is detachably attached, and the inside wheel cap 22 is configured in such a manner that a tire contact part 22c, which makes a circular arc on an outer peripheral side and is brought into contact with the tire part 20a, and an inclined plane part 27, which enters to a rim part 18a side from the tire contact part 22c and covers the spoke 19, are provided thereon.SELECTED DRAWING: Figure 2

Description

The present invention relates to a wheel structure of an agricultural work machine such as a passenger-type rice transplanter and various agricultural traveling vehicles.

Conventionally, the front wheels of a passenger-type rice planting machine have multiple (three) rims and bosses provided on the inner peripheral side of a rubber tire with lugs because it is necessary to reduce the weight of the body and steering resistance. The front wheels of the spoke-type small-diameter wheels connected by the spokes are adopted, and the front wheels are outside the tires to facilitate steering operation (steering) and to prevent mud from entering between the spokes, especially when turning. Wheel structures with wheel caps (outer hubcaps) covering the sides are already known. (See, for example, Patent Document 1)
The left and right front wheels 3 of such a passenger-type rice transplanter are the main body of the wheel support device 15 supported by the traveling machine body 2 (see FIG. 1) as shown in FIGS. 7 and 8 as conventional drawings in the present application. At the lower portions on both sides of the case 15a, the axle case 15b is vertically supported and is assembled to the axle 16 protruding outward from the axle case 15b.
As a result, the passenger-type rice transplanter steers the axle case 15b by rotating it around the vertical axis via the link arm 9b, the steering arm 15c, and the like, based on the steering operation of the driver handle 9a.
In the conventional structure in which the outer wheel cap 21 is attached to the tire 20 as shown in FIG. 7, the engaging tool 19a is via an engaging tool (U-shaped spoke mounting bracket) 19a that engages with each spoke 19. Both ends are bolted to the inner surface of the outer wheel cap 21 with each bolt so as to be attached.

Japanese Patent No. 35044497

The wheel structure shown in Patent Document 1 and those shown in FIGS. 7 and 8 have substantially the same structure. For example, the outer wheel cap 21 removes mud that tries to enter between the spokes from the outside of the front wheel 3 when turning. Has the advantage of reliably preventing. On the other hand, since it is not possible to prevent the intrusion of mud that tries to enter between the spokes from the inner side of the front wheel 3, the mud that adheres to the spokes 25 and the rim portion will rotate upward with the traveling rotation.
Some of the muddy soil (adhered soil) that is carried around in this way peels off due to its own weight during rotational movement and falls, but in particular, the adhered soil that strongly adheres to the corners where the tire rim portion 18a and the spokes 19 intersect is shown in the figure. As shown in 8, when the steering arm 15c of the wheel support device 15 is configured so as to enter the rim portion 18a side of the front wheel 3, the adhering soil that is rotated and falls on the steering arm portion becomes a large soil mass. There are problems such as the accumulation of soil and the things that have fallen on the surface of the rice field remain in a protruding state like a baby boomer.
In particular, as shown by the two-dot chain line A in FIG. 8, the adhering soil accumulated on the steering arm is removed from the inside (outside) of the tire by the steering arm 15c and the universal joint 9c of the link arm 7b pivotally supported at the tip of the steering arm 15c. ), And eventually the tire contact portion 22c of the outer wheel cap 21 is pushed open, causing a situation such as creating a large gap between the tire contact portion 22c and the tire portion 20a.
Therefore, in order to solve such a problem, if the tire 20 is configured to be separated from the steering arm 15c, in this case, the front wheel 3 moves outward as shown by the two-dot chain line in FIG. 8 and separates. Since the distance H is widened, there are problems such as an increase in vehicle width and a decrease in steering operability.

In the present invention for solving the above problems, first, the rim portion 18a of the tire portion 20a and the boss 17 are provided on the axle 16 pivotally supported by the wheel support device 15 of the traveling machine body 2 with a plurality of spokes 19. In the wheel structure of an agricultural work machine provided with an outer wheel cap 21 that is detachably attached to the tire 20 and covers the outer side surface of the tire portion 20a while assembling the connected tire 20 via the boss 17.
An inner wheel cap 22 that covers the middle side of the spoke 19 is detachably attached from the inner side surface of the tire portion 20a of the tire 20, and the inner wheel cap 22 is formed in an arc shape on the outer peripheral side to the tire portion 20a. It is characterized in that a tire contact portion 22c to be contacted and an inclined surface portion 27 which is inserted into the rim portion 18a side from the tire contact portion 22c and covers the spokes 19 are provided.
Secondly, the outer wheel cap 21 and the inner wheel cap 22 are individually formed, and the tire is sandwiched between the spokes 19 and the tire via the mounting portion 25 shared by the outer wheel cap 21 and the inner wheel cap 22. It is characterized by being attached to 20.
Thirdly, the inner wheel cap 22 is divided into a plurality of parts in the circumferential direction, and the divided inner wheel caps 22s are detachably connected in the circumferential direction.

According to the invention of claim 1, a tire in which a rim portion of a tire portion and a boss are connected by a plurality of spokes is assembled to an axle supported by a wheel support device of a traveling machine via the boss. In the wheel structure of an agricultural work machine provided with an outer wheel cap that is detachably attached to the tire and covers the outer side surface of the tire portion, the inner wheel cap that covers the middle portion side of the spoke from the inner side surface of the tire portion of the tire portion. The inner wheel cap is attached to the tire contact portion in an arc shape on the outer peripheral side to contact the tire portion, and the tire contact portion is inserted into the rim portion side to cover the spokes. By providing a face portion and configuring it,
When the wheel travels in a field of highly viscous mud, the outer wheel cap blocks the invasion and adhesion of mud that easily adheres from the outside, and the mud that tries to invade and adhere from the inside is blocked by the rim and spokes. Since the inner wheel cap that covers the middle part blocks, soil adhesion to both the rim part and the spokes is prevented, so it is possible to prevent the adhesion and rotation of large soil lumps.
In addition, the mud adhering to the surface side of the inner hubcap is promoted to slide down due to the shape of the inclined surface and the weight of the soil as it rotates upward, so that it is possible to eliminate a large drop of soil to the steering arm, etc. It is possible to prevent troubles caused by the accumulation of soil.
According to the second aspect of the present invention, the outer wheel cap and the inner wheel cap are individually formed, and the tire is sandwiched between the spokes and the tire via a mounting portion shared by the outer wheel cap and the inner wheel cap. By attaching to
Both hubcaps, which are individually formed, require a large number of mounting parts because they can be stably mounted on the tire with the spokes sandwiched through the mounting parts shared by the outer and inner hubcaps. It is possible to make a simple and inexpensive mounting structure without any problems.
According to the third aspect of the present invention, the inner wheel cap is divided into a plurality of parts in the circumferential direction, and the divided inner wheel caps are detachably connected in the circumferential direction.
When manufacturing a donut-shaped disc-shaped inner hubcap, the split inner hubcap that is divided into multiple equal parts in the circumferential direction can be made into a simple mold and can be mass-produced efficiently and at low cost.
The inner hubcap configured by connecting the split inner hubcaps was damaged even if troubles such as damage or deformation due to earth pressure or contact with foreign matter such as stone or wood occurred during running. Since only the split inner wheel cap needs to be repaired or replaced, there is an advantage that the maintenance work cost can be reduced.

It is an overall perspective view of the passenger type rice transplanter provided with the wheel structure to which this invention is applied. It is a right front perspective view which shows the state which concerns on the wheel structure of 1st Embodiment of this invention, and shows the state which the wheel is attached to the right side of the wheel support device of the front part of the machine body. It is a front sectional view which shows the structure of the wheel shown in FIG. It is an inward perspective view which shows the structure of the wheel shown in FIG. 2 in the state which the inner hubcap is removed. It is a perspective view of the outside of FIG. It is a right front perspective view which shows the aspect which concerns on the wheel structure of the 2nd Embodiment of this invention, and shows the aspect which the inner hubcap is divided and attached to the tire in the circumferential direction. It is a right front perspective view which shows the state which concerns on the conventional wheel structure, and the conventional wheel is attached to the right side of the wheel support device in the front part of the fuselage. It is a front sectional view of the wheel structure shown in FIG. 7.

An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 is a passenger-type rice transplanter shown as an example of an agricultural work machine, and the traveling machine 2 is supported so as to be able to run through a pair of left and right small-diameter front wheels 3 and large-diameter rear wheels 5, and is supported on the front side. The engine 6 mounted on the machine 6 is covered with a bonnet 7, a control unit 9 in which a driving handle 9a is erected via a rear control panel unit 8 is installed, and a planting work machine 11 is installed via a link mechanism 10 configured at the rear of the machine body. It is equipped with free up and down drive. As a result, the passenger-type rice transplanter 1 operates the planting work machine 11 to scrape the seedlings placed on the seedling stand 12 by the planter 13 when traveling in the field with the front wheels 3 and the rear wheels 5. Seedling planting work can be performed on the plant.

As shown in FIGS. The axle case 15b is detachably attached to the axle 16 that is pivotally supported outward, and is operated based on the maneuvering operation of the driver handle 9a via the link arm 9b and the steering arm (case arm) 15c. , The axle case 15b is steered by rotating it around the vertical axis.
The steering arm 15c has the same structure as that of a conventional one, and is integrally projected from the upper part of the axle case 15b toward the outside, and is connected by a universal joint attached to the upper part on the tip side thereof. The link arm 9b is connected by the portion 9c and is installed on the inward side of the front wheel 3.

That is, the steering arm 15c as the front wheel steering member has its tip inserted into the tire inner peripheral side space (spoke side space) on the inner side of the front wheel 3 via the mounting structure of the inner wheel cap 22 having a shape described later. By providing the wheels together, the structure is compact and strong without increasing the distance between the left and right wheels with respect to the wheel support device 15, and the mud that adheres and is carried around as the front wheels 3 rotate. The structure is such that the (adhered soil) is not significantly deposited on the steering arm 15c and the connecting portion 9c.

In the front wheel 3 of the embodiment, a tubular boss (wheel hub) 17 that fits outside the axle 16 and an annular rim member 18 made of a pipe material are equally spaced by three spokes 19 made of a round pipe material. The joint portion (tip side) to which the rim member 18 and the spokes 19 are joined is integrally coated and welded to the tire portion 20a with a lug by a rubber member or a synthetic resin material, whereby the cross-sectional mountain shape is formed. It is configured as a tire 20 forming the rim portion 18a of the above.
The outer and inner side surfaces of the tire portion 20a of the tire 20 are formed on the outer and inner hubcaps 21 made of synthetic resin and which are detachably attached according to the configuration described later. It has a smooth surface that allows contact in close contact.

Hereinafter, the wheel structure of the front wheel 3 including the tire 20, the outer hubcap 21, the inner hubcap 22, and the like will be described in detail with reference to FIGS. 2 to 6. The rear wheel 5 installed in the wheel support device at the rear of the machine body may have the same structure as the wheel structure, and thus the description thereof will be omitted.
First, the tire 20 has slopes 20b formed on both sides of the rim portion 18a connected to the tire portion 20a formed of the rubber member, which are slopes descending to the left and right to facilitate sliding of deposits such as mud. .. (Fig. 3)

The outer wheel cap 21 is a dish-shaped disc-shaped cap body 21a that covers the entire outer surface by abutting the tire contact portion 21C along the outer side surface of the tire portion 20a, and the boss 17 and fixing are fixed to the central portion thereof. The tire contact portion 21C in the mounting posture is formed by forming a through hole 21b having a shape that does not contact the bolt 17a and bending the outer periphery of the tire contact portion 22c into a ring shape so as to project outward. It can be elastically contacted with the tire 20. Then, on the back surface side of the cap body 21a, the reinforcing ribs 21d are formed so as to project with a desired reinforcing pattern, and the bolts 23, which are attachments, are screwed into the positions on both sides of the opposite spokes 19. The mounting portion 25 is provided so as to have substantially the same height as the reinforcing rib 21d. (Fig. 4)

The inner hubcap 22 has a donut-shaped disk shape as the cap body 22a, and a ring portion 22b that serves as a reinforcing member as an outward band-shaped ring is formed on the inner circumference of the main body, and the axle 16 is formed in a through hole formed by the ring portion 22b. And the boss 17 and the like are inserted. A tire contact portion 22c having substantially the same shape as that of the outer wheel cap 21 is formed on the outer periphery of the cap main body 22a, and a reinforcing rib is formed between the ring portion 22b on the back surface of the main body and the tire contact portion 22c. 22d is formed with a reinforcing pattern to form a protrusion.

In this configuration, the inner hubcap 22 forms mounting holes 22e as mounting portions into which bolts 23 can be inserted at positions facing each mounting portion 25 of the outer wheel cap 21, and opposes the spokes 19. An engaging portion 26 that allows the spoke 19 to be fitted in a semi-arc groove with respect to the position is formed in a notch shape in the ring portion 22b and the reinforcing rib 22d.
If necessary, the engaging portion 26 can also be provided on the reinforcing rib 21d formed on the back surface of the cap body of the outer wheel cap 21. (Fig. 4)

Then, in the mounting posture (FIG. 3), the inner wheel cap 22 is directed outward (spoke 19 side) between the tire contact portion 22c and the ring portion 22b formed on the outer periphery of the cap body 22a. An inclined surface portion 27 that is inclined and enters the rim portion 18a side is formed, and a flat surface portion 27a that is inclined along the spoke portion 19 from the inclined surface portion 27 toward the ring portion 22b is formed in a series. (Fig. 4)
As a result, the inner hubcap 22 has the inner hubcap 22 from the inside and the spokes facing each engaging portion 26 in the mounting posture shown in FIGS. 4 and 5 in which the outer hubcap 21 is combined with the tire 20 from the outside. Positioning is performed in the state of being fitted in the tire 19, and then the bolt 23 inserted in each mounting hole (mounting portion) 22e is inserted into the mounting portion 25 and bolted, and the outer wheel cap 21 and the inner wheel cap 22 for the tire 20 are obtained. The front wheel 3 to which is attached can be completed.

The wheel structure of the first embodiment configured as described above includes the mounting portion 25 at a predetermined position where the outer wheel cap 21 and the inner wheel cap 22 individually (separately) formed by synthetic resin molding face each other. A mounting hole (mounting portion) 22e is provided, and the spokes 19 can be firmly fastened from the outside and the inside by the bolts 23 inserted into both of them, so that the outer side surface and the inner side surface of the tire portion 20a can be firmly sandwiched. Both wheel caps 21 and 22 can be stably attached to the structure.

At this time, both the wheel caps 21 and 22 individually formed have each mounting portion 25 (including the mounting hole 25) shared by the outer wheel cap 21 and the inner wheel cap 22 with the spokes 19 sandwiched between them. Since it is mounted on the tire 20 via the tire 20, it has sufficient strength due to a simple and inexpensive configuration without requiring many mounting parts such as the spoke mounting bracket 19a as shown by the conventional cap mounting means shown in FIG. However, it can be stably attached to the tire 20.
In addition, the outer wheel cap 21 and the inner hubcap 22, which can be attached to the spokes 19 in a co-tightened state, do not easily rattle or deform for a long period of time even with a large inward earth pressure generated when the front wheels are steered. It has the advantage that it can be used with durability.

Then, when the passenger-type rice planting machine 1 travels in a highly viscous muddy field, the muddy soil that easily adheres to the tire portion 20a and the rim portion 18a of the tire 20 is outside as in the conventional one from the outside. The intrusion and adhesion are blocked by the wheel cap 21, and the mud that is about to intrude and adhere from the inside is blocked by the inner wheel cap 22 that covers the middle part of the rim portion 18a and the spoke 19, so that the inside of the rim portion as a whole is inside the rim portion. Since the invasion and adhesion of mud to the peripheral side are suitably prevented, the adhesion and rotation as a large mass of soil will be restricted.

Next, the wheel structure according to the second embodiment of the present invention shown in FIG. 6 will be described. The same configurations and operations as in the above-described embodiment are designated by the same reference numerals and description thereof will be omitted.
The tire 20 and the outer wheel cap 21 in this embodiment are the same as those shown in FIG. 4, while the inner wheel cap 22 is configured to be attached by combining those formed in a plurality of parts in the circumferential direction. Is partially different.
That is, in this embodiment, the inner wheel cap 22 shown in FIG. 6 has the same size and shape in the circumferential direction as opposed to the inner wheel cap 22 having the donut-shaped disk shape shown in FIG. 4, and has a connection allowance. It is configured by connecting a plurality of divided inner wheel caps 22s to each of the divided inner wheel caps 22s having a structure divided into three in a fan shape.

Each of the divided inner wheel caps 22s in the illustrated example has spokes 19 on the outer wheel cap 21 side at one end of a fan-shaped divided main body portion having a tire contact portion 22c, an inclined surface portion 27, a flat surface portion 27a, a ring portion 22b, and the like. The mounting holes (mounting portions) 22e and 22e facing the mounting portions 25 and 25 provided in pairs on both sides of the above are provided, and the mounting holes on the connection end side of the mounting holes 22e and 22e are provided for the other ends. A single connection mounting hole 22e for inserting the bolt 23 in a state of being overlapped with the 22e is provided.

As a result, in each of the split inner wheel caps 22s, the mounting holes 22e and 22e pairing the first split inner wheel caps 22s match the mounting portions 25 and 25 that form a pair of the outer wheel caps 21 to be mounted on the tire 20. After stacking the connection mounting holes 22e of the second split inner wheel cap 22s on the mounting holes 22e on the connection end side, insert the two bolts 23 respectively, and insert the first and second split inner wheel caps. 22s are overlapped and fastened, and then each bolt 23 is inserted and fastened in a state where the third split inner wheel cap 22s is overlapped by the same mounting means, so that the inner wheel similar to that of the first embodiment is fastened. It can be a wheel structure that acts as a cap.

As described above, the wheel structure in which the inner hubcap 22 is divided into a plurality of parts is a synthetic resin molded metal having a long and complicated structure for manufacturing the donut-shaped disk-shaped inner hubcap 22 of the first embodiment. It can be mass-produced at low cost only by a mold having a simple structure for molding one simple divided inner wheel cap 22s which is divided into three in a fan shape with respect to the mold.
Then, when the inner wheel cap 22 composed of the plurality of divided inner wheel caps 22s is subjected to excessive earth pressure during traveling, and due to strong contact with a large foreign substance such as stone or wood, the inner wheel cap 22 is damaged. In the event of deformation or deformation, only the damaged split inner wheel cap 22s can be removed and repaired or replaced promptly, so that maintenance work costs can be reduced.

In each of the above embodiments, the outer wheel cap 21 and the inner wheel cap 22 made of synthetic resin are attached via the bolts 23 so as to sandwich the spokes 19, but the method is not limited to the inner side. As shown by the two-point chain line in FIG. 3, the wheel cap 22 has a mounting piece portion 27b extending in a series from the inclined surface portion 27 or the flat surface portion 27a toward the outer wheel cap 21 side directly on the back surface side of the outer wheel cap 21. In this case, the inner hubcap 22 can be manufactured at low cost by press processing with an iron plate or the like.

Further, the inner wheel cap 22 may be a divided block cap 22r formed by dividing into blocks so that a predetermined range of the intersection where the spokes 19 and the rim portion 18a intersect can be individually covered. In this case, the split block cap 22r reliably covers the spokes 19, the rim portion 18a, and the corners on both sides of the intersection by the small inclined block cross section having the inclined surface portion 27 as shown by the diagonal line of the two-dot chain line in FIG. Therefore, the adhesion and rotation of mud can be regulated by a compact configuration. Further, since the split block cap 22r has elasticity due to synthetic resin or the like and it is easy to form a slit or the like for which the spoke 19 is inserted, which is not shown, it is easy to integrally manufacture the split block cap 22r with the outer wheel cap 21. There are advantages such as being able to do.

1 Agricultural work machine (passenger type rice transplanter)
2 Traveling machine 3 Front wheel 5 Rear wheel 15 Wheel support device 16 Axle 18a Rim part 17 Boss 19 Spoke 20 Tire 20a Tire part 21 Outer wheel cap 22 Inner wheel cap 22c Tire contact part 22s Divided inner wheel cap 25 Mounting part (mounting hole) )
27 Inclined surface

Claims (3)

The rim portion (18a) and the boss (17) of the tire portion (20a) are connected to the axle (16) pivotally supported by the wheel support device (15) of the traveling machine body (2) by a plurality of spokes (19). Agricultural work including an outer wheel cap (21) that is detachably attached to the tire (20) and covers the outer side surface of the tire portion (20a) while assembling the tire (20) via the boss (17). In the wheel structure of the machine
An inner wheel cap (22) that covers the middle side of the spoke (19) is detachably attached from the inner side surface of the tire portion (20a) of the tire (20), and the inner wheel cap (22) is attached to the outer peripheral side. A tire contact portion (22c) that forms an arc and is brought into contact with the tire portion (20a), and an inclination that enters the rim portion (18a) side from the tire contact portion (22c) and covers the spokes (19). A wheel structure of an agricultural work machine, characterized in that it is configured by providing a surface portion (27). The outer wheel cap (21) and the inner wheel cap (22) are individually formed, and the outer wheel cap (21) and the inner wheel cap (22) are shared with each other with the spokes (19) sandwiched between them. The wheel structure of the agricultural work machine according to claim 1, which is attached to the tire (20) via the portion (25). The agricultural work machine according to claim 1 or 2, wherein the divided inner wheel cap (22s) manufactured by dividing the inner wheel cap (22) into a plurality of parts in the circumferential direction is detachably connected in the circumferential direction. Hubcap structure.

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