JPH0228481B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a hollow tire wheel for paddy fields, and is used in traveling type, riding type, etc. rice transplanters. (Prior art) A tire for paddy fields consisting of a tire body made entirely of an elastic material and capable of being filled with air, and a wheel frame member having a plurality of spokes extending radially from the attachment part to the drive shaft. With hollow tire wheels,
The tire body has a pair of left and right bead portions, a sidewall portion, a shoulder portion, and a crown portion, and the crown portion, shoulder portion, and sidewall portion are joined over the outer periphery, and the radially outer end thereof is A vane lug is provided on the trailing side and has a plate-like slope portion whose radially inner end is located on the leading side in the tire rotation direction, and is joined to the outer periphery of the crown portion and protrudes in a tapered shape in the radially outer direction. A hollow tire for paddy fields, comprising a plurality of straight running lugs, a plurality of the blade lugs and the straight running lugs arranged at approximately regular intervals in the tire rotation direction, and the radially outer end apex of both lugs being located on substantially the same outer diameter line. A wheel is known, for example, from Japanese Utility Model Application Publication No. 147910/1983. (Problems to be Solved by the Invention) In the technology disclosed in the above-mentioned publication, the blade lugs of the tire body have higher rigidity than straight lugs, and the amount of deflection under the same load is smaller. For this reason, the amount of deflection changes in the tire body while driving, making the driving force unstable and decreasing.
This machine, such as a rice transplanter, is vibrating. In addition, the tire body can be replaced with wheel bone parts (spokes, etc.)
When assembling into
The stiffness increase in the vane lugs is further increased by the spokes, impairing the function of the hollow tire wheel and causing vibrations in the machine. Furthermore, the blade lug mainly has a float function (scraping water, mud shoveling) and has little straight-line function, and the straight-line lug mainly has a straight-line function and has little float function.If the blade lug and the straight-line lug are arranged alternately, the The number of pieces will be the same. As a result, the ground contact area of the blade lug is considerably wider than that of the straight travel lug, so although the float function is excellent, the straight travel performance may be poor, and there is a problem that the machine tends to meander. (Means for Solving the Problems) The present invention includes a tire body 7 made entirely of an elastic material and capable of being filled with air, and a plurality of spokes 3 extending in a radial direction from a mounting portion 2 to a drive shaft.
A hollow tire wheel 1 for paddy fields is made up of a wheel frame member 9 having A plate-shaped slope portion that is joined over the outer periphery of the crown portion 15, shoulder portion 16, and sidewall portion 17, and has a radially outer end located on the trailing side in the tire rotational direction and a radial inner end located on the leading side in the tire rotational direction. 12a
The crown portion 1 is provided with a vane lug 12 having a
5, the vane lugs 12 and the straight lugs 13 are arranged in large numbers at approximately regular intervals in the tire rotation direction, And both lugs 1
In order to solve the problems of the prior art described above, the following technical measures have been taken in the case where the radially outer end apexes of Nos. 2 and 13 are located on substantially the same outer radial line. That is, in the present invention, a plurality of the straight running lugs 13 are arranged at substantially constant intervals S1 between the blade lugs 12 facing each other in the tire rotation direction, and each of the plate-like slope portions of the blade lugs 12 12
a is located at a position out of phase in the tire rotation direction with respect to the radial direction of each spoke 3 in the wheel frame member 9. (Embodiments and Operations) Hereinafter, embodiments and operations of the present invention will be described with reference to the drawings. In Figures 1 to 5, reference numeral 1 denotes a hollow tire wheel mounted on a rice transplanter or the like, and the tire body 7
and the wheel frame member 9. Wheel bone member 9
is the mounting member 2 shown as a cylindrical boss attached to the drive shaft.
Four spokes 3 are welded in the radial direction (release direction) and reinforced with a disc 4, and the mounting members 8 of the tire body 7 are attached to fixing devices 5 and 6 provided at the outer ends of the spokes 3. , supports a tire body 7, and a wheel frame member 9 is constituted by the spokes 3 and fixing members 5 and 6. Note that the attachment member 8 may be a ring-shaped rim at the tip of the spoke 3. The tire body 7 is entirely made of an elastic material, has a large number of protrusions 11 (lugs) at regular intervals on the outer periphery, is made of an elastic material such as rubber with a hardness of about 80 degrees, and is hollow inside. It is used at an air pressure of ^about 2Kg/cm2. The protrusions 11 consist of blade lugs 12 having plate-like slope parts 12a projecting in the left-right direction at regular intervals (three in the embodiment) and straight-running lugs 13 having no plate-like slope parts 12a. , 13 are balanced in terms of strength and have approximately the same amount of deflection under a constant load to prevent vibration from being applied to the machine, and the plate-like slope portion 12a reduces driving force and buoyancy. configured to increase. Further, the plate-shaped slope portion 12a has its radial outer end located on the trailing side in the tire rotation direction 31, and its radial inner end located on the leading side in the tire rotation direction 31 and protrudes in the tire axial direction, The straight lug 13 is tapered in the radially outward direction. The tire body 7 includes a crown part 15 on which straight running lugs 13 are formed, and shoulder parts 1 at both left and right ends of the crown part 15.
6, a sidewall portion 17 extending radially inward from each shoulder portion 16, and a bead portion 18 extending radially inward from the radially inner end of each sidewall portion 17, The wall thickness from the crown part 15 to the middle of both sidewall parts 17 is approximately the same, and an inclined inner surface 19 is formed from the middle of this sidewall part 17 to the inner end of the bead part 18. 17 to bead part 18
The corner portions 20 extending therethrough are thick. The blade lug 12 has a plate-like slope part 12a integrally joined across the crown part 15, shoulder part 16 and sidewall part 17, and the blade lug 12 and the straight running lug 13 are connected in the tire rotation direction 3.
1 with an interval S1. The mounting member 8 is composed of a pair of left and right annular rigid members 22 and 23 made of metal or hard plastic, etc. The rigid members 22 and 23 have the same shape and are arranged mirror-symmetrically, and are attached to the buried part a. Part b
and has. The buried portion a has a hook-shaped cross section and is buried from the inner end of the bead portion 18 to the thick corner portion 20. This embedding is carried out by vulcanization at an angle of, for example, 140 to 180 degrees, and is fixed to the tire body 7 due to the hook shape. The mounting portion b has a straight cross section, protrudes radially inward from the bead portion 18, and has numerous holes 2 in the circumferential direction.
4 is bored in one mounting part 22b, and the other mounting part 2 is bored between the bead part 18 and the hole 24.
A sealing portion 25 is provided which is pressed between the sealing portion 3b and the sealing portion 3b. This seal portion 25 is a two-striped annular protrusion that is formed integrally with the bead portion 18 or formed separately and baked.
b, 23b are compressed by fastening,
Sealing is performed between both bead portions 18 to ensure airtightness of the tire body 7. As shown in FIG. 5, the tire body 7 includes a rigid member 2.
2 and 23 are embedded and both bead portions 18 are in the gap 26.
Both mounting portions 22 are molded in a shape that faces each other.
b, 23b are brought close to close the gap 26, and in this state, the fixtures 5, 6 are fastened via bolts, rivets, etc. The fixtures 5 and 6 have the same shape and have a hole 27, and the fixture 5 is welded to the outer end of the spoke.
Insert bolts 28 or rivets into 4 and 27 and tighten. Mounting part 2 in the position without fixtures 5 and 6
Only 2b and 23b are fastened with bolts 28 or the like. In this fastened state, the seal portion 25 is connected to both rigid members 22, 2.
3 to seal between both bead portions 18. Further, in this state, the inner circumferential surfaces of both bead portions 18 have a required angle that does not lift mud. Reference numeral 29 shown in FIG. 4 is an air injection valve that is provided through the bead portion 18, and this valve 29 may also be provided through the sidewall portion 17. To explain the protrusion 11 in more detail, the blade lug 12 has a large blade (plate-shaped slope portion 12a) A on the leading side in the forward rotational direction 31 and a small blade B on the trailing side, and both blades A and B are They intersect at the top C to form a mountain shape, and a protrusion D is formed at the center in the width direction of the top C, and the outer diameter of the top surface of this protrusion D is equal to the straight lug 1.
It is the same as the outer diameter of the top surface F of No. 3. The large blade A extends obliquely from the top C to the lower end of the sidewall portion 17 of the tire body 7, that is, the corner portion 20, and protrudes sufficiently laterally from the sidewall portion 17 to provide driving force and buoyancy during forward movement. is configured to increase the The small blade B extends obliquely from the top C to the crown part 15, and has the same amount of lateral protrusion as the large blade A, increasing the driving force and buoyancy during backward movement.
A space recess E is formed between the small blade B and the large blade A on the outside of the sidewall portion 17. The straight running lug 13 has a hexagonal shape when viewed from the front, and its width is approximately the same as the outer end of the sidewall portion 17 and has a tapered shape. It has the same width as the top surface of D. The rectilinear lug 13 has a longer circumferential length than the vane lug 12, and its entire portion substantially supports the load. On the other hand, the blade lug 12 has a plate-like slope portion 12a.
The slope part 12 supports the load by being grounded, including the slope part 12.
The load is weakly supported at both ends of a, and is substantially supported by the central portion thereof and the root portion of the slope portion 12a. The cross-sectional areas Q1 and Q2 shown by imaginary lines in FIG. 3 indicate the actual load-bearing areas of both lugs 12 and 13 at position P in FIG. Since it has the plate-like slope portion 12a, the cross-sectional area Q1 is horizontally long, and the cross-sectional area Q1 is approximately the same as the cross-sectional area Q2. That is, since the blade lug 12 has the plate-like slope portion 12a, its length is shortened so that it has substantially the same load supporting force as the straight-travel lug 13. By making the load supporting capacities of both the lugs 12 and 13 substantially the same, the amount of deflection of both the lugs 12 and 13 is also substantially the same under a constant load, and the tire wheel 1 deflects substantially uniformly all around the circumference, so that the tire wheel 1 is deflected substantially uniformly on the entire circumference, so that the tire wheel 1 is deflected substantially uniformly on the entire circumference, and the tire wheel 1 is deflected substantially uniformly on the entire circumference. Smooth rotation is possible without giving any vibration, and a plurality of linear lugs 13 are arranged between the blade lugs 12 whose circumferential pitch is S2 and below the pitch S1 (two in the figure).
) are placed here to ensure straightness. Furthermore, in the case of the blade lug 12, the plate-like slope portion 1
2a (large wings A), the rigidity of the sidewall portion 17 of the tire body 7 is greater than that of the straight running lug 13, and when the spokes 3 are also present, the difference in rigidity becomes remarkable. Therefore, as shown in FIG. 1, the phases of the extension lines (normal lines) of the spokes 3 and the plate-shaped slope portions 12a are shifted in the circumferential direction. FIG. 9 shows a second embodiment of the present invention, in which a tire wheel 1' has a tire body 7 including a protrusion 11.
It is made of an elastic material such as rubber mixed with organic short fibers such as nylon or polyester, and is intended to increase rigidity. In addition, holes 33 are formed in each of the embedded parts a of the rigid members 22 and 23 at intervals in the circumferential direction, and the elastic material forming the tire body 7 passes through these holes 33. This prevents the rigid members 22, 23 from separating from the housing. According to this, although the buried portion a may have a straight cross section, if it has a hook cross section, the rigid member 22,
Preventing 23 from leaving will become even more complete. Furthermore, the blade lug 12 is not provided with a protrusion, and its top surface has approximately the same outer diameter as the top surface F of the straight-travel lug 13, and the width (axial length) of the plate-shaped slope portion 12a is small. It's summery. A bulging portion 34 is provided at the opposing inner ends of both bead portions 18.
is formed, and by press-contacting the rigid members 22 and 23 and fixing them to the wheel frame member 9, both bulging portions 3
4 is press-contacted to form a seal portion 25 and air-tight the inside of the tire body 7. The configuration of this second embodiment can be applied to the hollow tire wheel 1 of the first embodiment as appropriate. In the third embodiment of the present invention shown in FIG. 10, the tire wheel 1'' has a tire body 7 fixed with a rim 35.The rim 35 is welded to the outer end of the spokes 3, 7. Even in a tire wheel in which the tire body 7 is fixed to such a rim 35, both lugs 12 shown in the first embodiment , 13 can be applied as is.Next, specific numerical values and dimensions of the hollow tire wheel 1 shown in FIG. 1 will be shown.

[Table] When the hollow tire wheel 1 shown in the above specific example was attached to a rice transplanter and used in a paddy field, uniform deflection occurred over the entire circumference, and no vibration was generated due to changes in the amount of deflection. I was able to obtain driving force and buoyancy. The present invention is not limited to the above specific example, and various settings can be made depending on the magnitude of the driving force, the soil quality of the field, etc. In particular, the lugs 12 and 13 exert greater driving force, buoyancy, etc. The dimensions of each part are determined in consideration of the purpose, strength, design, etc.
The amount of deflection under constant load is set to be approximately the same. (Effects of the Invention) The present invention is as described above, and in a wheel in which a hollow tire body having a vane lug and a straight running lug is assembled to a wheel frame member having spokes, the straight running lug is a vane that faces opposite in the tire rotation direction. Since a plurality of tires are arranged at approximately constant intervals between the lugs, there is an advantage that straight-line stability can be ensured while suppressing vibrations. In addition, since the plate-like slope portion of the vane lug is out of phase with respect to the direction of spoke release in the tire rotation direction, the increase in rigidity due to the slope portion of the vane lug is less likely to be increased by the spoke. In addition, vibration suppression and straight-line stability can be expected while fully utilizing the float function of the plate-like slope section. Therefore, the present invention is of great benefit as a hollow tire wheel for paddy fields, including rice transplanters.

[Brief explanation of drawings]

1 to 8 show a first embodiment of the present invention, FIG. 1 is a side view, FIG. 2 is an enlarged side view of the main part, FIG. 3 is an enlarged front view of the main part, and FIG. Figure 4 is the first
5 is a sectional view of the tire body before being fixed to the wheel frame member, FIG. 6 is a view taken in the direction of the arrow in FIG. 1, FIG. 7 is a view taken in the direction of the arrow in FIG. FIG. 8 is a sectional view taken along the line - in FIG. 1, and FIG. 9 is a second cross-sectional view of the present invention.
Embodiment FIG. 10 is a sectional view showing a third embodiment of the present invention. 1... Hollow tire wheel, 3... Spoke, 7...
...Tire body, 8...Mounting member, 9...Wheel frame member, 11...Protrusion, 12...Blade lug, 12a...
...Plate-shaped slope portion, 13... Straight lug, 15... Crown portion, 16... Shoulder portion, 17... Sidewall portion, 18... Bead portion.

Claims (1)

[Claims] 1. A tire body 7 made entirely of an elastic material and capable of being filled with air, and a mounting portion 2 for the drive shaft.
A hollow tire wheel 1 for paddy fields is made up of a wheel frame member 9 having a plurality of spokes 3 extending in a radial direction from the tire body 7, and the tire body 7 includes a pair of left and right bead portions 18, a sidewall portion 17, and a shoulder portion. 16 and a crown part 15, which are joined over the outer peripheries of the crown part 15, shoulder part 16, and sidewall part 17, with the radial outer end being on the trailing side in the tire rotation direction and the radial inner end being on the trailing side in the tire rotation direction. a blade lug 12 having a plate-like slope portion 12a located on the leading side of the blade; a straight lug 13 connected to the outer periphery of the crown portion 15 and protruding in a radially outward direction in a tapered shape; A large number of lugs 12 and straight lugs 13 are arranged at approximately regular intervals in the tire rotation direction, and both lugs 12, 13
in which the tops of the outer radial ends are located on substantially the same outer radial line, and a plurality of the straight running lugs 13 are arranged at substantially constant intervals S1 between the blade lugs 12 facing each other in the tire rotation direction. Each plate-shaped slope portion 12a of the blade lug 12 is connected to the wheel frame member 9.
A hollow tire wheel for paddy fields, characterized in that the spokes 3 are positioned out of phase in the tire rotational direction with respect to the radial direction of each spoke 3.