JP4601350B2 - Agricultural wheels - Google Patents

Description

  The present invention relates to agricultural wheels.

  Agricultural wheels mounted on agricultural machines that run on soft ground such as rice transplanters have elastic rings formed of elastic materials such as rubber, and are spaced apart from each other in the circumferential direction with respect to the elastic rings. A blade lug extending in the width direction from the side surface of the elastic ring body to the outer peripheral portion is provided at a plurality of opened positions. In many cases, an elastic ring is made by burning rubber around a ring-shaped metal rim, and the rim is provided with a plurality of disks such as spokes and disks on the inside, and these are used for agricultural machinery. Mounted on the axle.

The blade lug provided on this type of agricultural wheel is provided with a slant in a direction that lays down the grounding angle in order to secure buoyancy while obtaining traction, but this blade lug is used when climbing a fence etc. However, it has been pointed out that there is a risk of slipping due to insufficient traction force due to insufficient penetration of the bag.
In view of this, a technique has been proposed in which spikes are provided on the kick surface side of trapezoidal lugs that are interspersed between the blade lugs along the circumferential direction on the outer peripheral surface of the elastic ring. (See Patent Document 1).
JP 2002-248901 A

Agricultural wheels with spikes on the kick surface of the trapezoidal lug showed high traction when climbing a fence etc., and slip was eliminated.
However, the spike itself cannot be enlarged because the point where the spike is projected is a trapezoidal lug kick surface, and slippage that occurs when climbing ridges etc. due to the fact that mud is easy to adhere around the trapezoidal lug and easily clogs It was not something that was surely resolved.

  This invention is made | formed in view of the said situation, Comprising: It aims at providing the agricultural wheel which was able to eliminate reliably the slip which arises at the time of climbing, such as a kite.

In order to achieve the above object, the present invention has taken the following measures.
That is, the agricultural wheel according to the present invention has an elastic ring and stretches in the width direction from the side of the elastic ring to the outer periphery at a plurality of positions spaced apart from each other in the circumferential direction. In the agricultural wheel provided with the blade lug to take out,
On the front surface of the blade lug , which is grounded in advance during forward rotation , a traction protrusion that is long in the width direction is provided as a protruding shape in the forward rotation direction .
The pulling projection has a portion formed in a portion of the blade lug protruding in the width direction from the elastic ring body, and the protruding amount from the front surface portion gradually increases as going outward in the width direction. In addition to being formed, it has a side shape that tapers toward the tip in the protruding direction .

With such a configuration, the traction lug is provided on the blade lug itself, so that the traction lug can be formed in a necessary and sufficient size. For this reason, the action of the traction protrusion is not lost due to adhesion of mud or the like, and a sufficient traction force is exhibited even when climbing a fence or the like. As a result, the slip is surely eliminated.
Further, even when the blade lug is bent and deformed rearward in the rotational direction at the time of ground contact, it is possible to ensure the degree of protrusion as the traction protrusion with respect to the ground contact position as viewed from the rotation center of the elastic ring body. This can prevent the traction force from decreasing.

In addition, since the traction protrusion is formed in a side surface shape that tapers toward the tip in the protruding direction, the traction protrusion easily bites into the heel and the like, which is beneficial for increasing the traction force.
The pulling projection extends continuously from one end to the other end in the width direction of the blade lug at a position on the outer peripheral side of the elastic ring body, or extends from the side surface of the elastic ring body to the outer end in the width direction of the blade lug. It is good to be provided .

Also, a pulling projection provided to be continuous from one end to the other end in the width direction of the blade lug at a position closer to the outer peripheral side than the elastic ring body, and from the side surface of the elastic ring body to the outer end in the width direction of the blade lug The traction protrusion provided so as to extend may be provided at a predetermined interval in the radial direction of the elastic ring body.
A plurality of pulling protrusions can be provided at predetermined intervals in the radial direction of the elastic ring body.

The pulling projection can be provided inclined with respect to the width direction of the blade lug. In this way, it is possible to prevent the mud from adhering to the traction protrusions, and as a result, it is possible to prevent the traction protrusions from being clogged with mud and losing the effect.
A plurality of the pulling protrusions may be provided, and the plurality of pulling protrusions may be provided so as to be displaced from each other in the width direction.

As described above, the blade lugs are usually provided so as to be inclined in the direction in which the ground contact angle is laid down. Therefore, when the length of the blade lug along the inclined direction is set to H, the length h from the apex position of the blade lug which is radially outermost to the allowable range in which the traction protrusion is provided is h It is preferable that ≦ 0.6H.
By setting it within such an allowable range, it is possible to reliably pull out the traction force by the traction protrusion. That is, even if the traction protrusion is provided at a location outside the allowable range, the traction protrusion often does not reach the heel or the like when climbing the heel or the like, and therefore a satisfactory effect cannot be expected.

  With the agricultural wheel according to the present invention, it has become possible to reliably eliminate the slip that occurs when climbing a kite or the like.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show a first embodiment of an agricultural wheel according to the present invention. This agricultural wheel 1 has an elastic ring body 2 formed of an elastic material such as rubber. The elastic ring body 2 is obtained by attaching an elastic material 4 around a metal ring-shaped rim 3 (for example, baking rubber).

  A plurality of spokes 5 are provided on the rim 3 toward the center of the ring shape, and the tip of each spoke 5 is concentrated on the center of the ring shape of the rim 3, and a boss is provided on this portion. The elastic ring body 2 is attached to the axle of the agricultural machine by this boss. The spoke 5 may be replaced with a circular, triangular, or quadrangular disk.

The elastic ring body 2 is provided with blade lugs 7 at a plurality of positions spaced apart from each other in the circumferential direction, and an appropriate number of trapezoidal lugs 8 are provided between the blade lugs 7 and 7. It has been.
The blade lug 7 is provided in a state of protruding in the width direction from the side surface of the elastic ring body 2 to the outer peripheral portion. In the example shown in the figure, the elastic ring body 2 is integrally projected to both sides in the width direction (both left and right sides), but it may be displaced in the left-right direction and the circumferential direction to project in a staggered arrangement.

Each blade lug 7 is provided so as to be inclined so as to lay down the ground contact angle θ in order to secure buoyancy while obtaining traction. When the elastic ring body 2 rotates forward (see arrow R in FIG. 3), the front surface portion 7a of the blade lug 7 can be grounded as a wide area.
The blade lug 7 is provided with a pulling projection 10 for the front surface portion 7a. The pulling protrusion 10 is formed in a long shape along the width direction of the blade lug 7. Also this pulling projections 10 are formed in the side surface shape that tapers as made to the tip of the protruding direction.

In the first embodiment, since the blade lugs 7 as described above are assumed protruding integrally to both sides in the width direction of the elastic wheel 2, pulling projections 10, the width direction of the blade lugs 7 from end to end It is assumed that it is provided in a range that spreads continuously. The arrangement of the pulling projections 10 in this connection is the positioning, such as crossing position where the outer peripheral side of the elastic ring member 2 (in short does not interfere with the elastic ring member 2 position).

4 and 5, the traction protrusion 10 has a thickness that is displaced from the center of the blade lug 7 in the width direction (position of the elastic ring body 2) toward the outer side in the width direction. Is formed. That is, the thickness T on the outer side in the width direction is thicker than the thickness t of the portion closest to the elastic ring body 2, and the thickness gradually changes between them.
Therefore, even when the blade lug 7 is bent and deformed rearward in the rotational direction at the time of ground contact (see arrow V in FIG. 4), the protrusion as the pulling protrusion 10 with respect to the ground contact position viewed from the rotational center of the elastic ring body 2. The degree can be secured.

In agricultural wheel 1 according to the present invention, since the traction projections 10 for each vane lugs 7 are provided, as shown in FIG. 3, the projections for pulling even when climbing ridge like 10 Will firmly bite into the bag etc. and will be able to exert sufficient traction. Therefore, it does not lead to poor running such as slip.
Moreover, since the pulling projections 10 and need large enough so provided in the blade lugs 7 are secured, also protruding shape of the pulling projections 10 are tapered shape, this pulling projections 10 Mud soil is hard to adhere, and it is possible to bite into dredging. That much traction can be obtained.

6 and 7 show a second embodiment of the agricultural wheel according to the present invention. The most different point of the agricultural wheel 1 of the second embodiment from the first embodiment described above is that a plurality of traction protrusions 10 are provided at predetermined intervals in the radial direction of the elastic ring body 2. .
In this second embodiment it has assumed that traction protrusions 10 are two, provided. These two traction protrusions 10 (10A, 10B) is parallel to the each other. Of these, the outer and placement has been towards traction projections 10 along the radial direction of the elastic wheel body 2 (10A) is the same as that described in the first embodiment described above, the outer peripheral than the elastic ring member 2 It is provided so that the width direction of the blade lug 7 may be continuously spread from end to end across the side position.

In contrast, the other pulling projections 10 (10B) is being the inner disposed along the radial direction of the elastic wheel body 2, from the right and left sides of the elastic ring member 2 to the widthwise outer end of the blade lugs 7 It is provided to stretch. That is, the traction projections 10 (10B), the central portion in the longitudinal direction is a divided shape in the form impinging on the elastic ring member 2.
In this split-type and has been towed projections 10 (10B), the allowable range as follows is applied to the positioning of on the blade lugs 7 in relation to the radial direction of the elastic wheel body 2.

That is, as described above, the blade lug 7 is provided on the elastic ring body 2 so as to be inclined with respect to the radial direction (see the ground contact angle θ in FIG. 1). when placing a H a is, h when the blade lugs 7 and h ≦ 0.6H from the vertex position 7b to be outermost in the radial direction of the elastic wheel body 2, when positioning the traction projections 10 (10B) It is of the allowable range.
In short, even if the traction protrusion 10 (10B) is provided at a location outside the allowable range h, the traction protrusion 10 (10B) often does not reach the heel or the like when climbing the heel or the like. Because we cannot expect.

FIG. 8 shows a third embodiment of the agricultural wheel according to the present invention. In the agricultural wheel 1 of the third embodiment, the traction protrusion 10 is provided to be inclined (see α in FIG. 8) with respect to the width direction of the blade lug 7. The pulling protrusions 10 are formed to be short so as to be scattered in the width direction of the blade lugs 7. Furthermore, as in the case of the third agricultural wheel 1 even in the second embodiment of the embodiment, the traction projections 10 are more disposed at a predetermined distance from each other in the radial direction of the elastic wheel body 2.

The angle α at which each traction protrusion 10 is inclined in the width direction of the blade lug 7 is not particularly defined because it is for obtaining an effect of promoting the mud draining action. From the viewpoint of obtaining an effect, it is inappropriate that the angle α is too large. It may be within about 45 °, preferably around 30 °.
Further, the point where the traction protrusions 10 are formed short is intended to obtain an effect of promoting the mud draining action, and mud and water only have to flow between the adjacent traction protrusions 10, so that numerical values are particularly numerical. It is not stipulated. In addition, the effect | action of lowering | hanging the surface pressure at the time of biting into a wrinkle etc. (it becomes easy to bite in) is also anticipated. However, it is unsuitable that the pulling protrusion 10 is too short.

Also in the third embodiment, an allowable range corresponding to h when h ≦ 0.6H is applied to the positioning of the pulling protrusion 10 on the blade lug 7.
By the way, this invention is not limited to each above-mentioned embodiment, It can change suitably according to embodiment.
The positioning, length, side surface shape, and the like of the pulling protrusion 10 may be other than those shown in the above embodiments. For example, even when only one traction protrusion 10 is provided as in the first embodiment, the positioning can be appropriately changed within the allowable range h.

  The configuration of the elastic ring body 2 itself is not limited at all, and the cross-sectional shape and material of the rim 3 can be changed as appropriate. In some cases, the structure can be applied to a pneumatic tire structure without the rim 3.

It is the partial side view which showed 1st Embodiment of the agricultural wheel which concerns on this invention. It is AA arrow sectional drawing of FIG. It is the side view which showed the condition which climbs a fence with the agricultural wheel of 1st Embodiment. It is a BB line arrow directional view of FIG. It is the figure which showed the condition where the ground pressure demonstrated in FIG. 4 was cancelled | released. It is the partial side view which showed 2nd Embodiment of the agricultural wheel which concerns on this invention. It is CC sectional view taken on the line of FIG. It is sectional drawing which showed 3rd Embodiment of the agricultural wheel which concerns on this invention.

DESCRIPTION OF SYMBOLS 1 Agricultural wheel 2 Elastic ring body 7 Blade lug 7a Front part 10 Towing protrusion

Claims (7)

It has an elastic ring body (2) and projects in the width direction from the side surface to the outer peripheral part of the elastic ring body (2) at a plurality of locations spaced apart from each other in the circumferential direction with respect to the elastic ring body (2). In the agricultural wheel provided with the blade lug (7),
Said blade lug (7), the front portion of the ground prior to the time of forward rotation (7a), a long tow projections in the width direction (10) is provided as a projecting shape toward the forward direction of rotation,
The pulling projection (10) has a portion formed in a portion of the blade lug (7) protruding in the width direction from the elastic ring body (2), and the protruding amount from the front surface portion (7a) is An agricultural wheel characterized by being formed so as to gradually increase as going outward in the width direction and having a side shape that tapers toward the tip in the protruding direction . The pulling projection (10) is continuous from one end to the other end in the width direction of the blade lug (7) at a position on the outer peripheral side of the elastic ring body (2), or the side surface of the elastic ring body (2) The agricultural wheel according to claim 1, wherein the agricultural wheel is provided so as to extend from the blade to the outer end in the width direction of the blade lug . A pulling projection (10) provided so as to be continuous from one end to the other end in the width direction of the blade lug (7) at a position on the outer peripheral side of the elastic ring body (2), and a side surface of the elastic ring body (2) The traction protrusions (10) provided so as to extend from the blade lugs (7) to the outer ends in the width direction are provided at predetermined intervals in the radial direction of the elastic ring body (2). agricultural wheel according to claim 1 Symbol mounting features. The traction projections (10), agricultural wheel according to claim 1 Symbol mounting, characterized in that is provided with a plurality at a predetermined distance from each other in the radial direction of the elastic wheel body (2). The agricultural wheel according to claim 1 or 4, wherein the traction protrusion (10) is provided to be inclined with respect to the width direction of the blade lug (7). Of the traction projections (10) of the plurality of traction protrusions (10) according to claim 4 or claim 5 further characterized in that are provided so as to be positioned offset from each other in the width direction together are plurality Agricultural wheels. The blade lug (7) is provided so as to be inclined in the direction in which the ground contact angle is laid, and when the length along the inclined direction is set to H, the blade lug (7) that is radially outermost is provided. The length h from the apex position to the allowable range in which the pulling protrusion (10) is provided is set to h ≦ 0.6H. Agricultural wheels.

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