JP2003211909A - Farm wheel and attaching structure to axle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To resolve a problem in a farm wheel with a structure having a boss part provided with a shaft hole for attachment to an axle and an elastic tire part supported around the boss part via a tire supporting member where sometimes there is travel vibration caused by backlash between the shaft hole of the boss part and the axile. <P>SOLUTION: At least one detent interior angle part 10 is provided on an inner peripheral surface of the shaft hole 3 provided on the boss part 4. A shaft fixing bolt 12 capable of pressing the axle 2 inserted in the shaft hole 3 in its radial direction toward the interior angle part 10 is provided on the boss part 4. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural wheel and an axle mounting structure.

[0002]

2. Description of the Related Art As an agricultural wheel used in an agricultural machine such as a tractor, a boss portion provided with a shaft hole for attaching to an axle and an elastic tire portion supported around the boss portion via a tire supporting member. , And those are now well known (see JP 2000-238504 A, JP 8-2203 A, etc.). The tire support member is of a spoke type, a disc type, or a hybrid (eclectic structure) type of these.

Further, the elastic tire portion is classified into a hollow type that is inflated by air pressure and a solid type. Among these, the solid type has a rim over the entire circumference along the ring shape. The rim portion is embedded and the rim portion is connected to the tire support member. Further, the rim portion includes one using a hollow pipe and one formed by bending a plate material in the tire width direction. In such an agricultural wheel, as shown in FIG.
The shaft hole 101 provided in No. 00 is inserted into the axle 102 of the agricultural machine (not shown) to be mounted, and the fitting relationship between the shaft hole 101 and the axle 102 is shown in FIG.
As shown in Fig. 4, make sure that the regular hexagons are in a non-rotating state,
In addition, it is generally performed to further tighten and fix the shaft fixing bolt 103 screwed in the boss portion 100 in the radial direction.

[0004]

In the conventional agricultural wheels,
In some cases, the driving stability was adversely affected by driving vibrations, and the steering stability was also adversely affected. Then, when the cause of such traveling vibration was investigated, it was found that the following two points were greatly involved. That is, the first is backlash due to wear generated on the inner peripheral surface of the shaft hole 101 provided in the boss portion 100 and the outer peripheral surface of the axle 102 of the agricultural machine, and the second thereof is the rim portion 105 (FIG. 16). And FIG.
7)).

As shown in FIG. 15, abrasion occurs on the inner peripheral surface of the shaft hole 101 and the outer peripheral surface of the axle 102 because a minute gap X is originally generated between the fitting of the both. This is because the vehicle is gradually expanded by repeated traveling. Further, the deformation of the rim portion 105 occurs at the time of manufacturing this agricultural wheel, and when the elastic tire portion 106 is formed around the rim portion 105, a forming material (rubber or the like) is used.
That the rim portion 105 is locally recessed with the injection pressure of (see arrow Y in FIG. 16), or that the predetermined range of the rim portion 105 is collapsed with the material flow pressure during vulcanization (in FIG. 16). Arrow Z)).

The present invention has been made in view of the above circumstances, and it is a first object of the present invention to provide an agricultural wheel and an axle mounting structure capable of suppressing or eliminating traveling vibration caused by a boss portion. The purpose of. A second object of the present invention is to provide a mounting structure for an agricultural wheel and an axle that can suppress or eliminate traveling vibration caused by the rim portion.

[0007]

In order to achieve the above object, the present invention takes the following means. That is, the agricultural wheel according to the present invention is premised on having a boss portion provided with a shaft hole for attaching to an axle and an elastic tire portion supported via a tire supporting member around the boss portion. The following configuration is added. That is, at least one inner corner portion for preventing rotation is provided on the inner peripheral surface of the shaft hole provided in the boss portion, and the boss portion is inserted into the shaft hole while facing the inner corner portion. A shaft stop bolt is provided to enable the crushed axle to be pressed in its diameter direction.

With such a construction, the rotation preventing inner corner portion in the shaft hole is brought into contact with the rotation preventing outer corner portion provided on the axle side, and then the axle is fixed by the axle fixing bolt. It will be pressed toward the inner corner portion of the rotation stop. Therefore, in the shaft hole, the axle will be pressed against the inner corner portion of the detent without generating a gap.
Rattling does not occur in this part. Further, since rattling does not occur, the wear on the inner peripheral surface of the shaft hole and the outer peripheral surface of the axle hardly increases.

From the above, the traveling vibration caused by the boss portion is suppressed or eliminated, and the first object of the present invention is achieved. In the boss portion, it is preferable that a portion of the inner peripheral surface of the shaft hole where the shaft fixing bolt advances and retracts is formed as a flat surface. With this configuration, there is a case where the flat portion is provided in a state where the bolt end of the shaft fixing bolt faces the outer peripheral surface of the axle, and the flat portion and the flat surface in the shaft hole are a surface pair. This is because they come into contact with each other.

The axial hole preferably has a regular polygonal shape having an odd number of internal corner portions including the rotation preventing internal corner portion, and more preferably has a regular pentagonal shape or a regular triangular shape. is there. The outer periphery of the boss portion is preferably a polygon having a surface parallel to the flat surface of the shaft hole from the viewpoint of weight reduction. Further, as an agricultural wheel according to the present invention, it has a boss portion provided with a shaft hole to be attached to an axle, and an elastic tire portion supported via a tire supporting member around the boss portion, and an elastic tire portion. The rim portion formed by bending the plate material in the tire width direction over the entire circumference along the ring shape is embedded, and on the premise that this rim portion is connected to the tire support member, the following configuration Can also be added.

That is, the rim portion is provided with a reinforcing member for increasing the bending strength of the plate material along the tire width direction. Such a reinforcing member may be provided at a plurality of positions in the circumferential direction of the rim portion so as to be evenly arranged. This prevents the predetermined range of the rim portion from collapsing due to the material flow pressure during vulcanization when the elastic tire portion is formed around the rim portion at the time of manufacturing this agricultural wheel. It should be noted that such a configuration applied to the rim portion can be carried out independently of the above-described configuration for suppressing or eliminating traveling vibration with respect to the boss portion.

A plurality of reinforcing members may be arranged in a concentrated manner so as to correspond to a portion of the elastic tire portion where the molding material is injected toward the rim portion during wheel manufacturing.
By doing so, it is possible to prevent the rim portion from being locally recessed due to the injection pressure of the forming material at the time of manufacturing the agricultural wheel. It should be noted that such a configuration applied to the rim portion can also be carried out independently of the above-described configuration for suppressing or eliminating traveling vibration with respect to the boss portion. As a result, the traveling vibration caused by the rim portion is suppressed or eliminated, and the second object of the present invention is achieved.

On the other hand, in the structure for mounting the agricultural wheel on the axle according to the present invention, the above-mentioned agricultural wheel according to the present invention abuts on the inner corner portion of the shaft hole provided in the boss portion in the non-rotational plane pair. It is fitted to an axle having an outer corner portion and a flat portion that abuts against the bolt end of the shaft fixing bolt so as to be fixed, and is fixed by tightening the shaft fixing bolt. In this way, by providing a flat part on the axle side for receiving the bolt end of the shaft stop bolt provided on the boss part of the agricultural wheel, it is possible to ensure the pressing by the shaft stop bolt and to make the rattling (especially rotation). Direction) can be prevented.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of an agricultural wheel 1 according to the present invention. This agricultural wheel 1
Has a boss portion 4 provided with a shaft hole 3 for attachment to the axle 2, and an elastic tire portion 6 supported around the boss portion 4 via a tire supporting member 5. In the first embodiment, the tire supporting member 5 is shown as a spoke type, and the number of the spokes 7 is three. Each of these spokes 7 is formed of, for example, a hollow pipe, one end of which is connected to the boss portion 4 by welding, and the other end of which is embedded in the elastic tire portion 6 along the entire ring shape thereof. The rim portion (not shown) is connected by welding.

With respect to such a hollow pipe spoke type tire supporting member 5, it is usual that the rim portion in the elastic tire portion 6 is also formed by a hollow pipe, and this elastic The tire portion 6 is a solid type in which a forming material (rubber or the like) is attached so as to surround such a rim portion. In the agricultural wheel 1 according to the present invention having such a basic structure, the shaft hole 3 provided in the boss portion 4 has a regular pentagonal shape. Corresponding to the hole shape of the shaft hole 3, the axle 2 provided on the agricultural machine (not shown) side also has a regular pentagonal cross-section at the portion where the shaft hole 3 is fitted.

Therefore, when the agricultural wheel 1 is mounted on the agricultural machine side, when the shaft hole 3 of the boss 4 is fitted to the axle 2, a total of 5 flat surfaces formed on the inner peripheral surface of the boss 4 are formed. And a total of five flat portions formed on the outer peripheral surface of the axle 2 come into surface-pair contact with each other. In addition, at this time, a total of five inner corner portions formed on the inner peripheral surface of the shaft hole 3 in the boss portion 4 individually come into contact with a total of five outer corner portions formed on the outer peripheral surface of the axle 2, respectively. It has a detent effect. For this reason, idling does not occur between the boss 4 and the axle 2, and rattling is maintained in a state where rattling does not substantially occur.

As described above, the shaft hole 3 of the boss portion 4 has a regular pentagonal shape. That is, it is a regular polygon having an odd number of internal corners. Therefore, a total of five inner corners formed on the inner peripheral surface of the shaft hole 3 are opposed to the flat surface via the hole center of the shaft hole 3, respectively. Therefore,
An axial stop bolt 12 is provided so as to penetrate between the inside of the shaft hole 3 and the outer peripheral surface of the boss portion 4 toward the flat surface 11 facing one of the inner corner portions 10. Needless to say, the positioning of the shaft fixing bolt 12 is determined on the condition that it does not interfere with the tire supporting member 5 (spoke 7).

The shaft fixing bolt 12 is screwed into a nut member 13 fixed to the outer peripheral surface of the boss portion 4 by welding or the like, and is movable along the radial direction of the shaft hole 3. Instead of providing such a nut member 13, a female screw may be provided on the boss portion 4 itself, and the shaft fixing bolt 12 may be screwed into the female screw. When the shaft fixing bolt 12 provided on the boss portion 4 is tightened in this way, the bolt end presses the axle 2 in the diametrical direction thereof, so that the inner corner portion 10 of the shaft hole 3 is pressed against the inner corner portion 10. Then, the outer corners of the axles 2 facing each other in a plane pair are pressed against each other in a sliding manner. As a result, as is apparent from FIG. 2, the position of the apex of the inner corner portion 10 of the shaft hole 3 and the apex of the outer corner portion of the axle 2 are automatically corrected (both apexes are matched).
The state is corrected and the position is corrected so that the rattling does not occur thereafter.

From the above, the traveling vibration caused by the boss portion 4 is suppressed or eliminated. Figure 4
Is a second embodiment of the agricultural wheel 1 according to the present invention,
The main part (the figure corresponding to FIG. 1 of the first embodiment) is shown. This second embodiment is most different from the above-described first embodiment in that the shaft hole 3 provided in the boss portion 4 has a hexagonal hole shape, and the axle 2 also has a hexagonal shape. The point is that the cross-section has a hexagonal shape corresponding to the hole shape.

However, the hole shape of the shaft hole 3 is not an accurate hexagonal shape, and a portion corresponding to one inner corner portion of the hexagonal shape is formed as the flat surface 11. In addition, the cross-sectional shape of the axle 2 is not an accurate hexagonal shape, and the flat portion 15 is formed so as to correspond to the flat surface 11 provided in the shaft hole 3.
Are formed. Further, the shaft stop bolt 12 is provided so as to advance and retreat on the flat surface 11 formed on the inner peripheral surface of the shaft hole 3, and the bolt end of the shaft stop bolt 12 is a flat surface provided on the axle 2. The part 15 is pressed in a facing manner.

Therefore, the pressing by the bolt end of the shaft fixing bolt 12 does not laterally deviate from the axial center of the axle 2, and the axle 2 may be eccentric or the cross-sectional shape of the axle 2 may be deformed. There is no guarantee of reliable pressing. FIG. 5 shows a main part (a view corresponding to FIG. 1 of the first embodiment) of the third embodiment of the agricultural wheel 1 according to the present invention. This third embodiment is the same as the first embodiment described above.
The most different point from the embodiment is that the outer shape of the boss portion 4 is formed into a regular hexagon. The outer shape of the boss portion 4 can be formed not only in a circular shape but also in a polygonal shape. One of the outer shape flat surfaces is parallel to the flat surface 11 of the shaft hole 3, and the shaft fixing bolt 12 is penetrated. .

By doing so, each of the spokes 7 as the tire supporting member 5 can be firmly attached to the outer peripheral surface of the boss portion 4, and at the same time, the mounting position can be made highly accurate. It means that quality is being stabilized. Moreover, the boss portion 4 of the third embodiment is the first
The outer shape as shown in the embodiment is lighter than the circular boss portion 4. From these things, in the agricultural wheel 1 according to the third embodiment, the cause of the traveling vibration is prevented in advance. Of course, the reduction in weight leads to a reduction in material cost, which is beneficial.

FIG. 6 shows a main part (a view corresponding to FIG. 1 of the first embodiment) of the fourth embodiment of the agricultural wheel 1 according to the present invention. As shown in the fourth embodiment, in the present invention, the shaft hole 3 provided in the boss portion 4 includes:
At least one anti-rotation inner corner portion 10 is provided,
It suffices that a shaft stopper bolt 12 that can press the axle 2 in the diametrical direction is provided on the inner corner portion 10, and the other portions may have any shape (see FIG. 6). It is good even if it has a shape close to a circular hole.

The axle 2 may be provided with an outer corner portion which can be engaged with the inner corner portion 10 of the shaft hole 3. In addition, in addition, the tire supporting member 5 is a disc type, the rim portion (not shown) provided in the elastic tire portion 6 is other than a hollow pipe, and the elastic tire portion 6 is a pneumatic type. It is possible to make appropriate changes such as those. 7 to 9 show a fifth embodiment of the agricultural wheel 1 according to the present invention. The agricultural wheel 1 of the fifth embodiment includes a boss portion 4 provided with a shaft hole 3 for attachment to an axle 2, and an elastic tire portion 6 supported around the boss portion 4 via a tire support member 5. have.

A rim portion 20 formed by bending a plate material in the tire width direction is embedded in the elastic tire portion 6 over the entire circumference along the ring shape. The rim portion 20 is connected to the tire support member 5. In the fifth embodiment, the rim portion 20 has a cross-sectional shape of a "U" shape. The connection between the rim portion 20 and the tire support member 5 may be "connection" because both are integrally formed from the beginning, or another member may be "connection" by bolting, riveting, welding or the like. It may be one.

In the fifth embodiment, the tire support member 5 is a disc type, but it may be a spoke type. In the agricultural wheel 1 according to the present invention having such a basic structure, the rim portion 20 is provided with the reinforcing member 21 for increasing the bending strength of the plate material. The reinforcing member 21 is formed by vertically connecting fan-shaped spaces formed inside the "U" shape with plate pieces of the same shape and connecting them along the tire width direction by welding. It is fixed to 20.

Further, the reinforcing members 21 are provided at a plurality of positions in the circumferential direction of the rim portion 20 (five positions in the illustrated example) in a uniform pattern. For this reason, when the elastic tire portion 6 is formed around the rim portion 20 at the time of manufacturing the agricultural wheel 1, the rim portion 2 is accompanied by the material flow pressure during vulcanization.
It is prevented that the predetermined range of 0 falls (see the arrow Z in FIG. 16). The number of reinforcing members 21 provided (that is, the pitch in the circumferential direction) is also influenced by the strength of the rim portion 20 itself and the material flow pressure (outer diameter of the rim portion 20) generated in the material forming the elastic tire portion 6. Can be changed as appropriate.

In this case, the thickness and material of the reinforcing member 21, the shape of the side surface, and the like can be similarly changed as needed. Therefore, for example, as in the sixth embodiment shown in FIG. 10, the reinforcing member 21 may be formed into a “U” shape along the cross-sectional shape of the rim portion 20,
Further, as in the seventh embodiment shown in FIG. 11, it is also possible to provide the "rim" -shaped opening portion provided by the rim portion 20 so as to vertically bridge. Further, as in the eighth embodiment shown in FIG. 12, the reinforcing member 21 can be provided in a plurality at one place.

In the seventh embodiment, the rim portion 20 is viewed from the front, and the reinforcing members 21 are arranged in a V shape at each location.
Is a chevron (that is, the V shape in FIG. 12 is upside down)
Alternatively, the reinforcing members 21 may be provided in parallel with each other in a “river” shape with a predetermined gap (small gap) therebetween, or may be overlapped without a gap. Figure 1
3 is a main part of the ninth embodiment of the agricultural wheel 1 according to the present invention (a view corresponding to FIG. 7 of the fifth embodiment).
Is shown.

In the ninth embodiment, the reinforcing member 21
Is provided with a plurality of reinforcing members 21 in a concentrated manner so as to correspond to a portion (indicated by an arrow P) where the molding material of the elastic tire portion 6 is injected to the rim portion 20. In the present ninth embodiment, the reinforcing members 21 are provided in parallel with each other in the shape of a “river” with a predetermined gap (small gap) therebetween.
However, the present invention is not limited to this, and the V-shaped arrangement as shown in FIG.

By doing so, at the time of manufacturing the agricultural wheel 1, the rim portion 20 is caused by the injection pressure of the forming material.
Is locally depressed (see arrow Y in FIG. 16)
Is prevented. For this reason, traveling vibration caused by the rim portion 20 is suppressed or eliminated. The cross-sectional shape of the rim portion 20 is not limited to the one having the above-mentioned "U" shape, but may be a T-shape, an L-shape, or other bending shape in the tire width direction. Any structure can be applied as long as it has a different structure.

By the way, the present invention is not limited to the above-mentioned respective embodiments, but can be appropriately modified according to the embodiments. In particular, the shape, structure, material, application, etc. of the tread portion of the elastic tire portion 6 are not limited at all. When the outer shape of the boss portion 4 is formed in a polygonal shape, when the tire support member 5 is the spoke 7, it is preferable to set the multiple number of the spokes 7, but when the tire support member 5 is the disc type, As long as it has a surface parallel to the flat surface 11 of the shaft hole 3, it can be set to any polygonal shape of a triangle or more.

[0033]

As is apparent from the above description, in the agricultural wheel and axle mounting structure according to the present invention, at least one inner corner portion for preventing rotation is provided in the shaft hole of the boss portion, and this inner corner portion is also provided. Since the shaft stop bolts for pressing the axle in the diametrical direction are provided to the portion, traveling vibration caused by the boss portion can be suppressed or eliminated. Further, in the structure for mounting the agricultural wheel and the axle according to the present invention, since the rim portion is provided with the reinforcing member for increasing the cross-section bending strength, traveling vibration caused by the rim portion can be suppressed or eliminated. did it.

[Brief description of drawings]

FIG. 1 is an enlarged view showing a main part (around a boss part) in FIG.

FIG. 2 is a view showing a part of FIG. 1 (one inner corner of the shaft hole) in a further enlarged state and in a sectional state.

FIG. 3 is a side view showing the first embodiment of the agricultural wheel according to the present invention.

FIG. 4 is an enlarged view showing a main part (around a boss part) of a second embodiment of an agricultural wheel according to the present invention.

FIG. 5 is an enlarged view showing a main part (around a boss part) of a third embodiment of an agricultural wheel according to the present invention.

FIG. 6 is an enlarged view showing a main part (around a boss part) of a fourth embodiment of an agricultural wheel according to the present invention.

FIG. 7 is a side view showing a rim portion and a tire support member used in a fifth embodiment.

8 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 9 is a side view showing a fifth embodiment of the agricultural wheel according to the present invention.

FIG. 10 is a cross-sectional view showing a crushed main portion (around the rim portion) of a sixth embodiment of an agricultural wheel according to the present invention.

FIG. 11 is a sectional view showing a crushed main part (around the rim part) of a seventh embodiment of the agricultural wheel according to the present invention.

FIG. 12 is a side view showing a rim portion and a tire support member used in an eighth embodiment of the agricultural wheel according to the present invention.

FIG. 13 is a side view showing a rim portion and a tire support member used in a ninth embodiment of the agricultural wheel according to the present invention.

FIG. 14 is a side view showing the periphery of a boss portion of a conventional agricultural wheel.

FIG. 15 is a diagram showing a part of FIG. 14 (in the vicinity of the inner peripheral surface of the shaft hole) in an enlarged and sectional view.

FIG. 16 is a side view showing a state in which a rim portion and a tire supporting member used in a conventional agricultural wheel are deformed.

FIG. 17 is a cross-sectional view showing the periphery of a rim portion of a conventional agricultural wheel.

[Explanation of symbols]

1 agricultural wheels 2 axles 3 shaft holes 4 Boss 5 Tire support member 6 Elastic tire part 10 Non-rotating inner corner 12 Shaft stop bolt 15 Flats on the axle 20 Rim section 21 Reinforcement member

Claims (9)

[Claims] 1. A boss portion (4) provided with a shaft hole (3) for attachment to an axle (2), and this boss portion (4).
In an agricultural wheel having an elastic tire portion (6) supported around a tire supporting member (5), at least 1 is provided on the inner peripheral surface of the shaft hole (3) provided in the boss portion (4). An inner corner portion (10) for preventing rotation is provided at this location, and the boss portion (4) is provided with the axle (2) inserted into the shaft hole (3) toward the inner corner portion (10). An agricultural wheel characterized by being provided with a shaft stop bolt (12) capable of being pressed in the diameter direction. 2. The shaft hole (3) in the boss (4)
A part of the inner peripheral surface of the shaft stopper bolt (12) that advances and retracts is formed as a flat surface (11), and the bolt end of the shaft stopper bolt (12) faces the outer peripheral surface of the axle (2). When the flat portion (15) is provided on the flat surface (15), the flat portion (15) and the flat surface (11) in the shaft hole (3) can be brought into contact with each other by a surface pair. The listed agricultural wheels. 3. The shaft hole (3) in the boss (4)
The agricultural wheel according to claim 1 or 2, wherein the hole shape is a regular polygon having an odd number of inner corner portions including the rotation preventing inner corner portion (10). 4. The agricultural wheel according to claim 3, wherein the regular polygon is a regular pentagon or a regular triangle. 5. The agricultural product according to claim 2, wherein the boss portion (4) has a polygonal outer periphery having a surface parallel to the flat surface (11) of the shaft hole (3). Wheel. 6. The elastic tire portion (6) is embedded with a rim portion (20) formed by bending a plate material in the tire width direction over the entire circumference along a ring shape, and the rim portion (20). Is connected to the tire support member (5), and the rim portion (20) is provided with a reinforcing member (21) for increasing the bending strength of the plate material along the tire width direction. The agricultural wheel according to any one of claims 1 to 5. 7. The reinforcing member (21) has a rim portion (20).
7. The agricultural wheel according to claim 6, wherein the agricultural wheel is provided at a plurality of circumferentially equidistant positions. 8. A plurality of the reinforcing members (21) are intensively arranged so as to correspond to a portion where a molding material of the elastic tire portion (6) is injected toward the rim portion (20) during wheel manufacturing. The agricultural wheel according to claim 6, wherein 9. The agricultural wheel (1) according to any one of claims 1 to 8 has an inner corner portion (10) for preventing rotation of a shaft hole (3) provided in a boss portion (4) thereof. The shaft stop bolt (12) is fitted to an axle (2) having an outer corner portion that abuts on a surface pair and a flat portion (15) that abuts the bolt end of the shaft stopper bolt (12) in an opposed manner. An agricultural wheel mounting structure, characterized in that it is fixed by tightening.