JP3183593B2 - Paddy field vehicle wheels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates, on the car wheel of paddy fields for a vehicle such as a rice planting machine.

[0002]

2. Description of the Related Art Conventionally, as wheels mounted on a paddy field vehicle such as a riding rice transplanter, Japanese Unexamined Utility Model Publication No. Sho 57-185604 (conventional example 1) and Japanese Patent Application Laid-Open No. 63-284004 (conventional example 2) have been proposed. ) Are known.

[0003]

By the way, for example, in a rear-mounted four-wheeled rice transplanter of the rear mount type, when the planting device is lifted during turning traveling, the weight of the vehicle is displaced, and the load on the front wheels increases. When the paddy rubber wheel described in the first conventional example is used as a front wheel due to the weight displacement of the vehicle, the front wheel may be immersed in mud and may not be able to run due to a small tread area of the front wheel. Was.

On the other hand, in the second conventional example, since the tire is a pneumatic tire, the front wheel can be prevented from immersing in the ground to some extent. However, since the airframe is used to support the body by the tire internal pressure, the tire internal pressure must be maintained for a long time. However, paddy field vehicles such as rice transplanters are single-function vehicles and are used seasonally.
It is customary to store it in the unused state.
At the time of this long-term storage, it is difficult to maintain the tire internal pressure, and in fact, the tires are used as they are in the next fiscal year despite the fact that air is leaked. In this case, the tire is damaged at an early stage because of air deflation.

Further, the structure of a pneumatic tire is more complicated than a so-called rubber baked wheel and disadvantageous in terms of cost. Therefore, it is not preferable to use a pneumatic tire. Accordingly, the present invention is, despite the so-called rubber baking wheeled, it is possible to suppress the implantation into the mud, and Turkey to provide a wheel of the paddy fields a vehicle that can be inexpensively manufactured with a simple structure With the goal.

[0006]

The present invention according to claim 1 is provided.
Is an annular rim and a ring covering the rim and made of an elastic material.
And a plurality of rollers that project radially outward from the ring body.
In order to achieve the above-mentioned object, the following technical measures were taken for the wheels of a paddy field vehicle provided with wheels in the circumferential direction . That is, the wheel of the paddy field vehicle of the present invention is such that
A horizontally long elliptical ring in the left and right width direction outside the center of the rim
Left and right bulges that bulge out to the left and right, respectively, as a contour
The thickness of the left and right bulges is between the lugs.
Between the radially outward position of the ring body and the bulging portion
Thickness of the portion, the radially inward position of the
It is made thicker than the thickness of the middle part with the protrusion, and the lug is
A linear guide that extends circumferentially on the equator of the
Equipped with wings that extend laterally from the guide, which wings
The side view shape is formed into a substantially trapezoidal shape by the
Holes in the side of the wing to absorb vibration
Is formed, and the hollow depth of the hollow portion is the bulge.
Part thickness and less than half of this thickness.
The contour shape of the bulging portion and the contour shape of the hollow portion are ring-shaped.
Contour shape that is continuous in a curved line in the radial direction in the sectional view
And the lateral extension of the wing in the lug
The extension side is inclined backward in the forward direction of the wheel, and the wing
Is characterized by the fact that the kick surface is an inclined elevation surface having a receding angle .

[0007] The present invention according to claim 2 provides the above contractor.
3. The lug according to claim 1, wherein the wings on the lug are left and right in the circumferential direction.
Characterized by being arranged in an alternating staggered manner
It is.

Further, the present invention according to claim 3 provides the above-mentioned contractor.
In claim 1 or 2, the left and right sides of the ring of the left and right bulging portions
Direction width is the maximum width in the left and right direction of the wheel,
The width of the ring of the part shall be almost the same as the maximum width
It is characterized by the following. Further, the present invention according to claim 4
Akira according to claims 1 to 3 above, radially inward of the ring body
On the side, a mudguard section with a substantially mountain-shaped cross section is formed by left and right inclined surfaces
It is characterized by being formed integrally. Change
The wheels of the paddy field vehicle of the present invention according to claim 5
Items 1 to 4 are the left and right front wheels of a paddy field vehicle.
It is characterized by that.

[0009]

According to the wheel of the paddy field vehicle of the present invention described in claim 1, since the wheel body is provided with the bulging portion bulging in the left-right direction, the wheel is buried in mud. Is prevented. The bulging portion is thicker than an intermediate portion between the lug radially outward position and the bulging portion, and an intermediate portion between the radially inner position of the wheel body and the bulging portion between the lugs. It is said that
Since no extra elastic material is consumed in these intermediate portions, consumption of the elastic material constituting the ring body is suppressed , and
A hole-shaped hollow is formed on the side of the wing
With a simple structure.
Therefore, it can be manufactured at low cost.

[0010] Further, in the cross-sectional view of the ring body, a hole-shaped hollow is formed.
The contour shape of the bulge and the bulge is continuous in a curve in the radial direction.
This part bends when the lug touches the ground
It has a mud-repelling effect and is continuous in a curve
Therefore, adhesion of mud can also be prevented.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 6, a paddy field vehicle 1 exemplified by a rear-mounted type four-wheeled rice transplanter has a planting device 2,
Further, the front wheel 3 and the rear wheel 4 according to the present embodiment are mounted.

The planting device 2 of the paddy field vehicle 1 is movable up and down so that the posture can be changed between a planting operation posture and a standby posture. That is, during the planting operation in the field, the planting device 2 is in the planting operation posture, and the load of the planting device 2 is supported by the float 5 provided below the planting device. When the float 5 is in contact with the mud surface during turning or the like, it is difficult to perform a smooth turning traveling due to the resistance, so that the float 5 is lifted and held in the standby posture. At this time, vehicle weight displacement occurs in the paddy field vehicle 1 and the load on the front wheels 3 increases.

The front wheel 3 of the present embodiment is a so-called rubber baked wheel, and as shown in FIGS. 1 to 3, a central boss 6 and radially attached to the boss 6 in the circumferential direction so as to be equally arranged. It comprises three spokes 7, a rim 8 welded to the tips of these spokes 7, and a ring 9 made of an elastic material such as rubber which covers the rim 8. A lug 10 protruding radially outward is provided on the wheel body 9 so as to be adjacent in the circumferential direction. The lug 10 includes a linear guide 10 a extending linearly in the circumferential direction on the equator of the wheel body 9, and a wing 1 extending from the substantially center of the linear guide 10 a to the left and right one side.
0b, and the wings 10b of each lug 10
Are arranged alternately left and right in the circumferential direction in a so-called staggered manner.

[0014] The blade portion 10b is the forward direction C side of the mud Kemen the reverse direction D side is the non Kemen, substantially trapezoidal side view shape of the blade portion 10b by these kick surfaces and non kick surface It has been. The tip side of the wing 10b is inclined rearward in the forward direction C of the front wheel 3, and is a kick surface of the wing 10b.
Is an inclined elevation having a receding angle.
To secure the traction force and improve the earth discharging property. Further, the side surface portion of the wing portion 10b is hollowed out, and the hollowed portion 10c has a mud-repelling effect by bending when grounding, thereby reducing the amount of consumed rubber constituting the ring body 9. At the same time, it has a function of absorbing vibration when traveling on general roads.

Further, the straight guide portions 1 of each lug 10 are provided.
Between 0a, a concave portion 11 is formed in order to improve the traction force. The recess 11 need not be formed. Further, the ring body 9 integrally has a bulging portion 12 which bulges in the left-right width direction of the rim 8. In this embodiment, the contour shape of the bulging portion 12 is determined by a horizontally long elliptical shape as shown by a virtual line A in FIG. Thus, the thickness D1 of the intermediate portion between the radially outward position of the ring body 9 and the bulging portion 12 between the lugs 10 and the radially inward position of the ring body 9 and the bulging portion 12 Than the thickness D3 of the middle part of
Thickness D2 of the bulging portion 12 in this together are thick-walled
The bulging part 12 and the hollow part 10 c are in the cross section of the ring body 9.
The contour shape is continuous by a curve in the radial direction as shown in FIG.
It is in the shape. At the radial position of the front wheel 3,
The position L of the maximum width in the left-right direction of the ring body 9 due to the bulging portion 12
1 is located on the outer diameter side of the center position L2 of the rim 8. Furthermore, the hollow depth of the hollow portion 10c is:
As shown in FIG. 1, the thickness of the bulging portion 12 is not more than D2.
D2 / 2 or more (half or more of the thickness D2)
As a result, when the straight guide portion 10a of the lug 10 touches the ground.
While ensuring the rigidity of the bulging portion 12, the hollow portion 10c
To allow elastic deformation and absorb vibrations while securing straightness.
-ing

In this embodiment, the width in the left-right direction of the ring 9 at the bulging portion 12 (the maximum width H4) and the width of the ring 9 at the lug 10 are the same. They need not be the same. In addition, the ring body 9 integrally has a mud elimination portion 13 that extends over the entire circumference in the radially inner side. The mudguard 13 has a substantially mountain-shaped cross section, and its left and right inclined surfaces prevent muddy soil from accumulating on the inner peripheral side of the ring body 9. Note that the mud elimination unit 13 may not be provided.

The optimum shape of the wheel 9 will be described with reference to FIG. With respect to the radial width H1 of the ring body 9,
The width H2 from the radially outer position of the rim 8 to the radially outer position of the wheel body 9 is 41.8%. This value should be between 30% and 5%.
Setting the value in the range of 0% is optimal for effectively suppressing vibration due to traveling. The width H3 from the radially inner position of the rim 8 to the radially inner position of the ring body 9 is 18.2% of the radial width H1 of the ring body 9. The larger this ratio is, the better the mud splashing during traveling is, but when the vehicle 1 turns, the resistance due to the mud pushing increases.

With respect to the horizontal width H 4 of the ring body 9,
The width H5 × 2 of the left and right bulges 12 of the rim 8 is 43.3%. FIGS. 4 and 5 show the rear wheel 4 of the present embodiment. The same components as those of the front wheel 3 described above are denoted by the same reference numerals, detailed description thereof will be omitted, and different components will be described.
A plurality of lugs 10 are integrally provided adjacent to the wheel body 9 of the rear wheel 4 at equal intervals in the circumferential direction, and a blade plate 16 is integrally formed with a predetermined number of lugs 10 interposed therebetween. Is provided.

The lug 10 of the rear wheel 4 is a substantially trapezoidal projection protruding radially outward of the wheel body 9. In addition, the blade plate 16 has a flat plate shape, protrudes greatly to the left and right sides and inward of the ring body 9, and is inclined with respect to the radiation α. As shown in FIG. 5, a bulging portion 12 bulging in the left-right width direction is also formed on the ring body 9 of the rear wheel 4.

According to the present embodiment, the bulging portion 12 is provided on the wheel body 9 even when the weight of the front wheel 3 is increased by lifting the planting device 2 during turning of the vehicle 1 and the load on the front wheel 3 is increased. As a result, the tread surface of the front wheel 3 becomes large, so that embedding of the front wheel 3 in the mud can be suppressed, and the amount of rubber constituting the wheel body 9 can be minimized. Since the structure is simple, the manufacturing cost can be reduced.

Further, by providing the bulging portion 12,
Even if the length of the wing 10b of the lug 10 is increased, the wing 10b
Stiffness can be secured, and the traction force can be effectively improved. In addition, since the front wheel 3 of the present embodiment is not a pneumatic tire but a solid tire, it is possible to reduce maintenance work without air bleeding after being left for a long period of time.

The same applies to the rear wheel 4.
Next, a manufacturing apparatus 20 for manufacturing the front wheel 3 described above.
Will be described with reference to FIGS. 7 and 8. FIG. In FIG. 7, the production mold apparatus 20 includes an upper mold 2 which can be joined and separated from each other.
1, a lower mold 22, and a centering 27 inserted into the boss 6 of the front wheel 3. A ring body 9 having a lug 10 when the mold is matched is provided at a portion corresponding to the upper mold 21 and the lower mold 22.
Are formed continuously in the circumferential direction to form a cavity 25.

The upper die 21 can be raised and lowered by a lifting device (not shown). The lower die 22 is a fixed type, on which the rim 8 of the front wheel 3 is inserted and set. The holding pin 2 for supporting the rim 8 inserted and set in the recess 24 by floating above the bottom of the recess 24 is provided in the recess 24 of the lower mold 22.
6 are protruded and are arranged at intervals in the circumferential direction. The holding pin 26 is provided at a position corresponding to a radially inward position of the ring body 9 and a position corresponding to an intermediate portion between the bulging portion 12, and a tip portion of the rim 8 corresponding to the intermediate portion of the ring body 9. To come into contact with the part. That is, the rim 8 is supported by the holding pin 26 from below on the inner peripheral side. In addition, the holding pin may be provided in the concave portion 23 of the upper die 21.

The upper and lower dies 21 and 22 are provided with spokes 7.
Is provided with a support fitting 28 for supporting the vicinity of the outer end portion. That is, the support fittings 28 are a pair of upper and lower parts, and are fixed to the upper and lower dies 21 and 22. Support bracket 2 for upper die 21
A small cavity 29 is formed between the upper die 21 and the cavity 25 on the side of the cavity 8.

According to the manufacturing type apparatus 20, the front wheel 3 is manufactured as follows. First, rim 8 and spoke 7
An adhesive is applied to the outer end in advance, and a release material is applied near the outer end of the spoke 7. Then, while inserting the centering 27 into the boss 6, the rim 8 is placed in the lower mold 22, and the vicinity of the outer end of the spoke 7 is supported by a support fitting 28.
(See FIG. 8). At this time, since the holding pin 26 of the lower mold 22 supports the rim 8 from below on the inner peripheral side, the rim 8 can be accurately centered with respect to the lower mold 22 by the holding pin 26.

On the outer side of the cavity 25 of the lower mold 22, a rubber mass 30 formed by extruding rubber to form a band is placed in an annular shape as shown in FIG. Thereafter, the heated upper mold 21 is lowered toward the lower mold 22, and the rubber mass is crushed by the pressure to flow into the cavity 25, while covering the outer periphery of the rim 8 while pressing the rim 8 against the lower mold 22; A lug 10 is formed, and is further flowed to the outer end of the spoke 7 to cover it. At this time, since the holding pin 26 is located at a position corresponding to an intermediate portion between the radially inward position of the ring body 9 and the bulging portion 12, that is, a thin portion of the ring body 9, the holding pin 26 Of the rubber cavity 25 can be minimized.
The flow of the rubber into the (concave portions 23, 24 of the upper and lower dies 21, 22) can be made smooth.

The cavity 25 is substantially filled, and the spokes 7
The rubber that has flowed to the outer end is blocked by the support fitting 28, and the excess rubber flows into the small cavity 29 of the upper mold 21 and a vent (not shown). When the upper die 21 is opened after the ring body 9 is vulcanized and formed on the rim 8 in this manner, the excess rubber that has flowed into the small hollow portion 29 forms a rubber protruding portion. And the front wheel 3 is completed.

When the upper and lower dies 21 and 22 are clamped to form the ring 9 around the outer periphery of the rim 8 in the cavity 25, the holding pin 26 of the lower die 22 has a predetermined thickness around the lower part of the rim 8. When the mold is released after vulcanization, the holding pin 2 is attached to the lower mold side as shown in FIG.
6 are formed as the holes 14. Although the above-mentioned manufacturing type apparatus 20 is shown for manufacturing the front wheel 3, it can also be used for manufacturing the rear wheel 4 by changing the design of the shapes of the concave portions 23 and 24 of the upper and lower dies 21 and 22.

The present invention is not limited to the above-described embodiment, but can be modified as appropriate.

[0030]

As described above, the paddy field vehicle of the present invention
For both wheels, the wheel bulges in the width direction of the rimHorizontal oval
Circular outline shapeA swelling portion, the swelling portionThickness
Is the distance between the radially outward position of the
Middle partThickness, And the radially inward position of the ring and the bulge
Because it is thicker than the middle part of the
So-called rubber baking while reducing the amount of elastic material used
The embedding of the wheel in mud is suppressed even though it is a wheel.
Can be.

Further, the wheels of the paddy field vehicle of the present invention have lugs.
The wing has a hole in the side of the wing
Not only absorbs vibration but also reduces the amount of elastic material used
be able to.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line AA of FIG.

FIG. 2 is a side view of a front wheel of the paddy field vehicle according to the embodiment of the present invention.

FIG. 3 is a development view of the front wheel, in which (a) shows an equatorial plane and (b) shows a side surface.

FIG. 4 is a side view of a rear wheel of the paddy field vehicle according to the embodiment of the present invention.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is an overall side view of the paddy field vehicle.

FIG. 7 is a cross-sectional side view showing an apparatus for manufacturing wheels of a paddy field vehicle according to an embodiment of the present invention.

FIG. 8 is an operation explanatory view of the manufacturing type apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 paddy field vehicle 3 front wheel 4 rear wheel 6 boss 7 spoke 8 rim 9 wheel body 10 lug 12 bulging part 20 manufacturing mold device 21 upper mold 22 lower mold 23 upper mold recess 24 lower mold recess 26 holding pin

Claims (5)

(57) [Claims] 1. An annular rim (8) and covering said rim (8)
And a ring (9) made of an elastic material.
(9) In a wheel of a paddy field vehicle provided with a plurality of lugs (10) protruding radially outward in a circumferential direction, the wheel body (9) has a diameter larger than the center of the rim (8). Outside position
In the left-right width direction, the shape is a horizontally long ellipse.
Each has bulging portions of the left and right bulging (12), said left
The thickness (D2) of the right bulge (12 ) is determined by the lug (1).
0), the thickness (D1) of the intermediate portion between the radially outward position of the ring body (9) and the bulging portion (12), and the radially inward position of the ring body (9). The lug (10) extends in the circumferential direction on the equator of the ring (9), which is thicker than the thickness (D3) of the intermediate portion with the bulging portion (12).
Straight-ahead guide (10a) and sideways from this guide (10a)
The wing portion (10b) has a substantially trapezoidal shape in a side view due to a kick surface and a non-kick surface.
Is, the hole-like hollow portion for vibration absorption to the side surface portion of the blade portion (10b) (10c) is formed, the hollowing
The hollow depth of the portion (10c) is the thickness of the bulging portion (12).
Thickness (D2) or less and half or more of this thickness (D2).
And the contour of the bulging portion (12)
The outline shape of the punched portion (10c) is shown in a cross-sectional view of the ring (9).
And have a contour shape that is continuous with a curve in the radial direction
Both sides of the lug (10) on the wing (10b) side
The extension side is inclined backward in the forward direction C of the wheel.
The kick surface of the wing (10b) is an inclined elevation with a sweepback angle.
Wheels of paddy vehicle, characterized by being. 2. A wing (10) in said lug (10).
b) is arranged as a zigzag pattern alternately left and right in the circumferential direction.
Wheels of paddy for a vehicle according to claim 1, characterized in that. 3. The ring body (9) of the left and right bulging portions (12).
The width (H4) in the left-right direction is the maximum width in the left-right direction of the wheel (9), and the width of the wheel body (9) in the lug (10) portion is substantially the same as the maximum width. The wheel of the paddy field vehicle according to claim 1 or 2, wherein: 4. A mudguard (13) having a substantially mountain-shaped cross section is formed integrally on the radially inner side of the wheel body (9) by left and right inclined surfaces. The wheel of the paddy field vehicle according to any one of the above. 5. A wheel for a paddy field vehicle, wherein the wheels according to claim 1 are left and right front wheels of the paddy field vehicle.