JPH0754002Y2 - Agricultural wheels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an agricultural wheel with an annular pipe or air, which is used for agricultural machines such as rice transplanters, binders, combines or management machines.

(Prior Art) This type of agricultural wheel includes a pipe burning wheel made by burning rubber on an annular pipe and a pneumatic tire wheel, both of which have a square lug and a blade to obtain traction and buoyancy in mud. And a lug at predetermined intervals in the circumferential direction. For example, it is shown in Japanese Utility Model Laid-Open No. 60-138807 and Japanese Utility Model Laid-Open No. 63-88504.

(Problems to be solved by the invention) In these conventional wheels, the vane lugs have sufficient buoyancy and are inclined with respect to the center line of the wheel so that the vane lugs can be sufficiently lifted out of the mud without lifting the mud. The inner diameter end is designed to rotate in advance.

However, since the feather rug is straight in a side view, when the subsidence amount is 20 to 30 cm, the feather lug also lifts the mud when it comes out of the mud and puts it on the seedlings after planting. It may be dropped, carry mud around and make it difficult to bite into the field, or slip.

In addition, since the linear vane lugs in side view locally increase the rigidity of the wheels, they are a cause of vibrations when traveling on the road.

Therefore, it is conceivable to use a blade lug having an arcuate side view as disclosed in Japanese Utility Model Publication No. 59-9922. However, although this conventional technique can reduce lifting and vibration of mud, the rigidity of the blade lug on the radially outer end side becomes too low, which causes another problem that the traction force is reduced.

The present invention solves the above-mentioned problems of the prior art by forming a blade lug in a side view from a radially outer end to a substantially linear portion and from the middle portion to a radially inner end in an arc shape, so that an overall circular shape is obtained. It is an object of the present invention to provide an agricultural wheel that has been solved by forming an arc shape.

(Means for Solving the Problem) A specific means for solving the problem in the present invention is that the elastic ring body 5 has angular lugs 8 and blade lugs 7 at predetermined intervals in the circumferential direction. In a side view, 7 is an agricultural wheel in which a straight line AB connecting the radially inner and outer ends A and B has a narrow angle θ of 25 to 45 ° with respect to the centripetal line α of the elastic ring body 5, and the blade lug 7 is a side view. In, in a substantially linear shape from the radial outer end A to the midway portion, and from the midway portion to the radial inner end B passing through the radial inner and outer ends A and B and the central portion C thereof, a circular arc shape projecting to the radial outer side of R80 to 150 It is located on the line β of.

(Operation) When the agricultural wheel 1 rolls in mud in a state of sinking by 20 to 30 cm, the square lug 8 mainly generates a traction force, and the blade lug 7 also generates a traction force together with a buoyancy force. When the vane lug 7 comes out of the mud, the inner diameter end B of the blade lug 7 comes out before the outer diameter end A of the blade lug 7 so that the lifted mud is reduced.

In a side view, the blade lug 7 has a substantially linear shape from the radially outer end A to the middle portion and secures a traction force with substantially the same rigidity as the conventional one, and the central portion C rises from the middle portion to the radially inner end B. In addition, since it has a circular arc projecting outward from the radius of R80 to 150, it exhibits the same earth removal performance as the circular arc blade lug.

When the blade lug 7 enters the soil and hits the cultivator, the blade lug 7 tends to be deformed so that the curvature of the circular arc becomes small. However, not only the outer end A of the diameter but also the middle part receives the resistance from the soil. , It receives earth pressure that makes it straight from an arc shape, resulting in internal stress that pushes out a substantially straight portion in the radial direction, increasing the rigidity and improving the biting into the tiller. As a result, a strong traction force is generated by maintaining the angle of the linear portion normally.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In the first embodiment shown in FIGS. 1 to 6 and 11, this agricultural wheel 1 is a pipe baking wheel, and an annular pipe core material is provided at the tips of three spokes 3 radially attached from the boss 2. 4 is welded and rubber is baked around the core material 4 to form elastic wheels 5.

In the elastic ring body 5, blade lugs 7 are formed on the tubular portion 6 at equal intervals in the circumferential direction, and two angular lugs 8 are formed between the blade lugs 7. The outer diameters of both lugs 7, 8 are substantially the same. It is the same.

The tubular portion 6 is coated on the outer periphery of the core material 4 in a substantially equal thickness,
The ring-shaped inner peripheral side has a watershed projection 9 that projects radially inward, and has a shape that prevents mud from accumulating on the inner peripheral side.

The square lug 8 projects from the outer periphery of the tubular portion 6 into a square trapezoidal shape, and its tip has a smaller cross-sectional area than the middle portion,
It has a shape that prevents it from buckling at the same time as making it possible to penetrate the mud well.

As is apparent from FIG. 1 in a side view, the vane lug 7 has a radially outer end A having substantially the same diameter as the top of the square lug 8, and a straight line AB connecting the radially outer end A and the radially inner end B is a boss. The narrow angle θ is set to 25 to 45 ° with respect to the centripetal line α passing through the center of 2, and the central portion C thereof projects radially outward from the straight line AB, and the radial inner and outer ends A,
The line passing through B and the central part is the arc line β of R80-250.

As is apparent from the enlarged view of FIG. 11, the blade lug 7 is
The portion from the outer diameter A to the middle portion (for example, the central portion C) is a substantially linear portion, and the portion from the middle portion to the inner diameter portion is an arc-shaped portion located on the arc line β, and the central portion C Is a straight line AB
Since it is on the outer radial direction, the narrow angle of the straight line portion with respect to the centripetal line α is larger than that of the straight line AB, and the straight line portion and the arcuate portion are connected so as to be continuous at a contact point.

If the narrow angle θ is smaller than 25 °, the buoyancy is small and the bite becomes excessive, and if it is larger than 45 °, the traction force is lowered and the mudguard is deteriorated due to insufficient biting.

Further, the curvature of the arc line β is slightly different depending on the wheel diameter, the length of the blade lug 7, etc., but if the radius is smaller than R80,
Mud may collect inside the blade lug 7 and it may be difficult to lift it up. If it is larger than R250, it will be difficult to remove mud because it approaches a straight line. The preferable range of the curvature of β of the arc line is R100 to 150.

The blade lug 7 has a radially outer end A whose plane shape is substantially linear as shown in FIG. 2 and whose front shape is substantially trapezoidal as shown in FIG. As a result, the biting of the outer diameter end A into the mud is good.

A substantially triangular backup portion 11 is formed between the blade lug 7 and the tubular portion 6 on the trailing side of the wheel rotation direction 10.

The blade lug 7 largely protrudes to the left and right from the tubular portion 6, and the amount of rubber is larger than that of the square lug 8, but the radially outer portion within the width of the tubular portion 6 is slightly smaller than that of the square lug 8, and when grounded. 2, because the blade lug 7 has an arcuate portion, FIG.
As indicated by the dotted line, an elastic deformation force that reduces the curvature is about to be generated, and the blade lug 7 is also subjected to earth pressure as a reaction force of the traction force by the soil near the tiller even in the middle thereof, so that the arc shape is reduced. A linear force is generated, and both forces oppose each other.

The second embodiment shown in FIGS. 7 to 10 is a pneumatic agricultural wheel 1 '.
An elastic ring body 5 ′ having a tread portion 13, a shoulder portion 14, a side wall portion 15 and a bead portion 16 is attached to an annular rim 17, and a valve 18 provided on the rim 17 supplies air of a required pressure. Can be injected.

The elastic ring body 5'has vane lugs 7'at predetermined intervals in the circumferential direction,
Between the blade lugs 7 ', three substantially hexagonal truncated pyramid-shaped square lugs 5'
Are integrally molded. The outer diameter A of the blade lug 7'has substantially the same diameter as the top of the square lug 8 ', and the inner diameter B of the blade lug 7'is located in the middle portion of the sidewall portion 15 and does not reach the beat portion 16, and the elastic ring The diameter is larger than the inner diameter of the body 5 '.

The side view of the blade lug 7'is similar to that of the first embodiment,
The straight line AB connecting the inner and outer ends A and B has a narrow angle θ of 2 with respect to the centripetal line α.
The arc line β, which is 5 to 45 ° and which passes through the radially inner and outer ends A and B and the central portion C thereof, is a radially outward protruding curve of R80 to 150.

In the second embodiment as well, as in the first embodiment, the traction force by the blade lug 7 is increased to reduce the amount of mud lifting and the vibration. Particularly, regarding the vibration, the amount of bending when traveling on a road with a 200 kg load is linear in a side view. The blade lug was 11.0 mm and the square lug was 13.5 mm, but with the side view arcuate blade lug, it can be made almost equal to the square lug, vibration is reduced, and riding comfort is improved.

FIG. 12 shows a modified example of the side view of the blade lug 7, in which a straight portion is formed in the central portion C, and a straight line is formed from the central portion C through the circular arc to the radial outer end A. It is connected by a straight line or a circular arc to B through an arc, and is generally in the shape of a circular arc with a radius R80 to 150 protruding radially outward, and is formed in a substantially straight line from the radial outer end A to the middle portion. .

Further, the present invention is not limited to the above-described embodiments and modifications, but can be modified in various ways. For example, the blade lug 7 may be one blade protruding from the elastic ring body 5 to one side or one blade protruding in a staggered manner.

(Effect of the Invention) According to the present invention described in detail above, since the blade lug 7 has a substantially linear shape on the radially outer end A side, it is possible to secure a traction force similar to that of a conventional linear lug, and the overall shape is a radially outer protruding shape. Since it has a circular arc shape, it is possible to secure the same soil discharging performance as a conventional circular arc lug, and furthermore, when the blade lug 7 is grounded in the soil,
The load receives a deforming force that reduces the curvature of the circular arc, and at the same time, a force that makes it linear by earth pressure is applied.Therefore, an internal stress that pushes outward in the radial direction is generated in the approximately linear portion, and as a linear lug. It is possible to further increase the biting force and the traction force of the road, and the earth pressure is not received on the road. Therefore, the bending difference between the corner lug 8 and the like is reduced by elastically deforming the whole and on the radially inner end B side. Vibration can be reduced.

[Brief description of drawings]

1 to 6 show a first embodiment of the present invention. FIG. 1 is a side view of a main part, FIG. 2 is a view taken in the direction of arrow II in FIG. 1, and FIG. 3 is III in FIG. -III line cross-sectional view, FIG. 4 is a IV-IV line cross-sectional view of FIG. 6, FIG. 5 is a view on arrow V of FIG. 1, FIG. 6 is an overall side view, and FIGS. Fig. 7 shows an embodiment, Fig. 7 is a side view of the main part, Fig. 8 is a view taken in the direction of arrow VIII in Fig. 7, Fig. 9 is a sectional view taken along line IX-IX in Fig. 7, and Fig. 10 is Fig. 7 X arrow view, 1st
FIG. 1 is an enlarged side view of the side view shape of the blade lug of the first embodiment, and FIG. 12 is an enlarged side view showing a modification of the side view shape of the blade lug. 5 ... Elastic wheel body, 7 ... Blade lug, 8 ... Square lug, A ...
... outer diameter end, B ... inner diameter end, C ... central part, α ... centripetal line, θ ... narrow angle, β ... arc line.

Claims (1)

[Scope of utility model registration request] 1. An elastic ring body (5) has angular lugs (8) and blade lugs (7) at predetermined intervals in the circumferential direction, and the blade lugs (7) are radially inside and outside in a side view. In an agricultural wheel in which a straight line (AB) connecting the ends (A) and (B) has a narrow angle (θ) of 25 to 45 ° with respect to the centripetal line (α) of the elastic ring body (5), the blade lug (7) In a side view,) is a substantially straight line from the outer diameter end (A) to the middle portion and the inner diameter portion (B) from the middle portion.
Is located on an arcuate line (β) projecting radially outward of R80 to 150 passing through the inner and outer ends (A) and (B) and the central portion (C) thereof. .