JP3720967B2 - Paddy wheel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paddy field wheel, and is used for a traveling wheel of a riding rice transplanter, a irrigation direct seeder or the like.
[0002]
[Prior art]
Conventionally, a paddy field wheel in which an annular rim is used as a core and an elastic ring body is formed by covering the whole with an elastic material, and blade lugs are provided on the outer peripheral portion of the elastic ring body at predetermined intervals in the circumferential direction. Is known and used for traveling wheels of passenger rice transplanters.
In order to obtain buoyancy and traction force, the blade lugs of the paddy wheel are usually formed so as to be inclined toward the wheel forward direction with respect to the wheel centripetal line in a side view. Such blade lugs are generally formed in a straight line when viewed from the side, but when the blade lugs come out of the mud, the mud is lifted, and when used in a riding rice transplanter, after planting Or drop it on the seedling.
[0003]
In order to prevent this, a blade lug is formed in an arc shape projecting radially outward in a side view to improve soil removal (see Japanese Utility Model Publication No. 2-97104) (Prior Art 1).
By the way, if the inclination angle of the blade lug is large with respect to the centripetal line, a large buoyancy can be obtained, but the traction force decreases.If the inclination angle is small with respect to the centripetal line, a large traction force is obtained, but the buoyancy decreases. In the inclination of the blade lug that is linear in side view as described above, sufficient buoyancy and traction are not necessarily obtained.
[0004]
For this reason, by increasing the inclination angle from the middle part of the blade lug to the outer end of the wheel relative to the wheel centripetal line from the outer end to the middle part of the blade lug, There is one in which traction force is obtained in the range from the middle part to the middle part, while buoyancy is obtained in the range from the middle part to the inner diameter end (see Japanese Patent Laid-Open No. 2-204102) (prior art 2).
[0005]
[Problems to be solved by the invention]
In the prior art 1, although the blade lug is formed in an arc shape in the side view, the inclination angle with respect to the centripetal line of the blade lug is large in the side view, and sufficient traction force is not obtained.
In the prior art 2, since the blade lug has the above-mentioned shape, buoyancy and traction force are obtained, and the soil removal performance in the backward movement is improved, but the blade during the forward movement that occupies most of the work in the paddy field. The rug acts to scoop up mud and is inferior in soil removal.
[0006]
That is, the reverse direction surface of the blade lug is a convexly curved surface, whereas the forward direction surface is formed to be concavely curved, so that the concave surface lifts mud when moving forward, It drops on the adjacent seedling after planting.
In view of the above problems, an object of the present invention is to provide a paddy wheel that obtains sufficient traction force and is excellent in soil removal during forward movement.
[0007]
[Means for Solving the Problems]
The present invention has taken the following technical means for achieving the above object. That is, the feature of the present invention is that, in a paddy wheel provided with a blade lug on the outer peripheral portion of the elastic ring body at a predetermined interval in the circumferential direction, the blade lug extends from the midway portion to the radially inner end in a side view. The inner diameter of the blade lug is approximately 25 ° relative to the inner diameter of the blade lug so that the forward direction of the blade lug is convex in the forward direction. It is in the point made into the diameter outside inclined by the angle of -45 degrees .
[0008]
According to this configuration, buoyancy is obtained in the middle part from the outer diameter end inclined toward the wheel forward direction with respect to the centripetal line, while large in the inner diameter part from the middle part in the front direction direction facing substantially the centripetal direction. Traction is obtained.
And since the forward direction surface is formed so that the outer end to the midway part is inclined in the forward direction, and the midway part to the inner end is directed substantially in the centripetal direction, this surface is convex. This prevents the mud from being lifted when moving forward.
Further, in the present invention, the wheel rearward direction surface of the blade lug can be formed substantially parallel to the wheel forward direction surface, and in this case, from the middle part of the rearward direction side surface. Since the inner diameter end faces substantially the centripetal line direction as well as the forward rotation direction surface, sufficient traction force can be obtained even in reverse.
[0009]
Furthermore, in the present invention, the wheel rearward direction surface of the blade lug can be formed so as to tie the radially outer end and the radially inner end substantially linearly in a side view. Since the reverse direction side surface does not become a concave surface for lifting mud, it is possible to prevent a decrease in soil discharge performance during reverse travel.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show a paddy wheel 1 according to a first embodiment of the present invention. The paddy wheel 1 is a pipe-baked wheel that is used as a rear wheel of paddy field vehicles such as a riding rice transplanter, and is made of an annular pipe at the tip of three spokes 3 provided radially from the boss 2. A rim 4 is welded, and rubber is baked around the rim 4 to form an elastic ring body 5. A reinforcing plate 6 is provided between the spokes 3 in the vicinity of the boss 2, and an attachment hole 7 for attaching a car wheel or the like to the side of the wheel 1 is formed in the reinforcing plate 6.
[0011]
A blade lug 9 is formed in the cylindrical portion 8 of the elastic ring body 5 at equal intervals in the circumferential direction, and two angular lugs 10 are formed between the blade lugs 9. The outer diameters of both lugs 9 and 10 are substantially the same. Moreover, the cylindrical part 6 is coat | covered by the outer periphery of the rim | limb 4, The water-dispersed protrusion 12 protruded in the radial direction is formed in the inner peripheral side, and it has the shape which prevents mud from accumulating on the inner peripheral side. It has become.
The blade lug 9 is greatly extended to the left and right as shown in FIG. 3, and as shown in FIG. 2, the wheel forward rotation direction with respect to the centripetal line α is from the radially outer end A to the midway portion B in the side view. The outer diameter 14 is formed to be inclined by 40 ° on the F side, and the inner diameter 15 is formed so that the midway portion B to the inner diameter end C are substantially directed in the centripetal line α direction. The blade lug 9 is formed such that the wheel forward rotation direction surface 17 and the reverse rotation direction surface 18 are substantially parallel to each other, and has a shape that is bent in a “<” shape when viewed from the side.
[0012]
In addition, the inclination | tilt angle with respect to the centripetal line (alpha) of the outer diameter 14 can be suitably set according to the soil etc. of the place where this wheel 1 is used within the range of 25 degrees-45 degrees. Here, if the inclination angle θ is smaller than 25 °, the buoyancy is small and the bite is excessively engulfed into the tiller. To do.
When the paddy wheel 1 rolls in a state of being slightly submerged in the mud, the angular lugs 10 mainly generate traction force. Further, the outer diameter 14 of the blade lug 9 generates traction force as well as buoyancy. Further, since the inner diameter 15 of the blade lug 9 is oriented substantially in the centripetal direction α, a large traction force is generated. In particular, since the forward rotation direction surface 17 and the reverse rotation direction surface 18 of the inner diameter 15 are both substantially oriented in the centripetal direction α, a large traction force can be obtained both when the paddy wheel 1 is rotated forward. .
[0013]
Further, when the paddy wheel 1 rolls forward, the forward direction surface of the blade lug 9 is formed in a convex shape in the forward direction, so that the mud lifts when the blade lug 9 comes out of the mud. Therefore, it is possible to prevent the mud from being dropped on the adjacent seedling after planting.
FIG. 5 shows a paddy wheel 21 according to the second embodiment of the present invention. The difference from the first embodiment is that the rearward direction surface 25 of the blade lug 23 is formed so as to connect the radially outer end A and the radially inner end C in a substantially straight line in a side view. The point is that it is a flat surface. That is, the blade lug 23 has a triangular shape in a side view and the rigidity of the blade lug 23 is higher than that of the first embodiment. Further, since the rearward direction surface 25 of the blade lug 23 is substantially flat, compared with the first embodiment in which the rearward direction surface 25 has a concave shape, the rearward direction surface 25 during the rearward rotation of the paddy wheel 21 The amount of mud lifted by the rolling direction surface 25 is reduced. Since the forward rotation direction surface 17 has the same shape as that of the first embodiment, it can obtain a large traction force and has an excellent soil removal property during advance.
[0014]
In addition, about the structure similar to 1st Embodiment, the same code | symbol was attached | subjected and description was abbreviate | omitted.
6-8 has shown the paddy wheel 31 implemented as a front wheel of the vehicle for paddy fields. The paddy wheel 31 is a pipe baking wheel, similar to the paddy wheel 31 for the rear wheel, and an annular pipe rim 34 is provided at the tip of three spokes 33 radially attached from the boss 32. The elastic ring body 35 is formed by welding and baking rubber around the rim 34. A reinforcing plate 36 is provided between the spokes 33 near the boss 32.
[0015]
A disk 38 for preventing mud clogging is attached to the outside of the paddy wheel 33. The disk 38 is made of metal, and a mounting hole at the center thereof is fitted to the boss 21, and an outer peripheral portion is welded to the rim 34, and is fixed integrally with the wheel.
In order to prevent interference with the spokes 33, as shown in FIG. 8, the portion 40 of the disk 38 corresponding to the spokes 33 is formed in a concave shape.
When working with a paddy field vehicle with such a wheel 31 provided with a disk 38, mud clogging is prevented between the spokes 33, and mud masses are prevented from falling on adjacent seedlings and damaging the seedlings. Is done. In addition, if there is a gap between the outer periphery of the disk 38 and the side surface of the elastic ring body 35, mud may enter through the gap. However, the outer periphery of the disk 38 is fixed to the rim 34. Such is prevented.
[0016]
The present invention is not limited to the above embodiment. For example, the present invention can be applied to a wheel having a pneumatic tire.
[0017]
【The invention's effect】
As described above, according to the present invention, sufficient traction force can be obtained, and at the time of forward movement, the amount by which the blade lugs lift mud is reduced, and the soil removal performance is improved.
Further, when the forward direction surface and the backward direction surface of the blade lug are formed in a substantially parallel shape, traction force from the outside of the diameter from the middle part of the blade lug can be obtained during reverse as well as forward. .
In addition, when the blade lug in the direction of reverse rotation is formed in a substantially straight line from the outer diameter end to the inner diameter end in a side view, it is possible to prevent a decrease in soil discharge performance during reverse travel.
[Brief description of the drawings]
FIG. 1 is a side view of a paddy wheel according to a first embodiment of the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is a cross-sectional view taken along the line II of FIG.
4 is a cross-sectional view taken along line JJ in FIG. 1. FIG.
FIG. 5 is an enlarged side view of a main part of a paddy wheel according to a second embodiment of the present invention.
FIG. 6 is a side view of a paddy wheel (front wheel).
7 is a cross-sectional view taken along the line KK of FIG.
8 is a cross-sectional view taken along line LL in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Wheel for paddy fields 5 Elastic ring body 9 Blade lug 14 Diameter outside 15 Diameter inside 17 Forward rotation direction surface 18 Reverse rotation direction surface A Diameter outer edge part B Middle part C Diameter inner edge part

Claims (3)

In the paddy field wheel provided with blade lugs (9) at predetermined intervals in the circumferential direction on the outer periphery of the elastic ring body (5),
The blade lug (9) has a radially inner portion (15) from the middle portion (B) to the radially inner end (C) in the side view, which faces the centripetal direction (α).
From the midway part (B) to the outer diameter end (A), the forward rotation direction surface of the blade lug (9) is convex in the forward rotation direction (F) with respect to the inner diameter (15). A paddy field wheel characterized in that the outer diameter (14) is inclined at an angle of 25 ° to 45 ° .   2. The paddy wheel according to claim 1, wherein a wheel rearward direction surface (18) of the blade lug (9) is formed substantially parallel to the wheel forward direction surface (17).   A wheel rearward direction surface (18) of the blade lug (9) is formed so as to connect the radially outer end (A) and the radially inner end (C) in a substantially straight line in a side view. The paddy wheel according to claim 1.

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