JPH065202Y2 - Agricultural wheels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an agricultural wheel used for agricultural equipment such as rice transplanters.

(Prior Art) In this type of wheel, as shown in FIG. 7, a ring-shaped core material is coated with an elastic material such as rubber to form an elastic ring body 5, and lugs are formed at predetermined intervals in the circumferential direction on the ring body. 8 and the blade 7 are integrally formed (see, for example, JP-A-54-45215). This feather 7
In order to obtain traction force and buoyancy in the mud, in the radial cross section of the wheel body, is projected from the circumferential surface of the wheel body in the outer circumferential direction of the entire circumference.

Further, the blade 7 has an inclination angle θ with respect to the centripetal line α of the wheel body in order to improve the mud removal when the blade 7 comes out of the mud. In other words, if the blade angle θ is set on the same line as the centripetal line α in order to maximize traction and buoyancy, the mud will be placed on the entire front surface of the blade when it comes out of the mud. A fatal defect occurs as a wheel of a rice transplanter that falls when it comes up and pushes down the seedlings of the adjacent row that have already been planted.

Therefore, the blade 7 is inclined by the angle θ with respect to the centripetal line α so that the mud is not placed on the front side surface of the blade when the blade comes out of the mud. The inclination angle θ is appropriately set according to the conditions such as the size of the wheel and the field used.

(Problems to be solved by the invention) However, in the above-mentioned conventional technique, the inclination angle θ of the blade 7 is
Even in the best condition, mud accumulates in the triangular corner β between the inner diameter end 7a of the blade and the inner peripheral surface 5a of the wheel 5, and is lifted. The triangular corner portion β is a portion generated by tilting the blade 7.

The present invention solves the above-mentioned problems of the conventional technology.

(Means for Solving the Problem) A feature of the present invention is that an annular portion made of an elastic body has lugs and blades at predetermined intervals in the circumferential direction, and the blade has a radially inner end portion that is radially outer when moving forward. In an agricultural wheel that has an inclination angle with respect to the centripetal line of the annular portion so as to precede the end portion, and the radial inner end of the blade projects radially inward from the inner circumference of the annular portion, A watershed portion is formed between the inner peripheral surface and the front side surface in the rotational direction of the radially inner end portion of the blade protruding from the inner circumferential surface, and the ridgeline of the watershed portion has a smooth chevron shape substantially orthogonal to the inclination of the blade. Both side portions of the blade that are formed to project laterally from the annular portion of the blade and the radially inner end portions that project inward are a thick-walled root portion on the annular portion side and a wall portion thinner than the root portion. And a step portion formed at a boundary portion between the tip portion and the root portion. The watershed portion is that provided over the entire length to the tip of the distal portion from the root portion of the radially inner end portion is divided into two said radially inner ends to the left and right.

(Operation) When the agricultural wheel travels through the mud, when the blade comes out of the mud, the mud tends to collect in the triangular space between the inner diameter end of the blade and the inner peripheral surface of the annular portion.

However, according to the present invention, since the watershed portion is formed in the triangular space and the space is eliminated, clogging of mud is prevented.

And, since the blade has a thick root and a thin tip connected continuously via a step, when the blade comes out of the mud, the tip vibrates due to elastic deformation and its restoring force, Brush off the mud that adheres to the inner diameter of the blade.

At this time, since the inner diameter end is divided into two parts by the watershed ridge, the left and right tip parts have different vibrations, which facilitates the detachment of the adhering mud.

(Embodiment) An embodiment in which the present invention is applied to an agricultural wheel of a rice transplanter will be described below with reference to the drawings of FIGS. 1 to 5.

The agricultural wheel is welded to the boss 1 at the center, three spokes 2 made of a hollow metal having a circular cross section, which are radially attached to the boss 1 in a circumferentially equidistant manner, and the boss 1 and the spokes 2. A reinforcing disc 3, a hollow metal rim 4 having a circular cross section which is welded to the ends of the spokes 2 and serves as an annular core material, and a ring body 5 made of an elastic material such as a rubber material for covering the rim 4 The wheel is rotated in the direction of the arrow shown in FIG. 1 when moving forward.

The ring 5 is made of an elastic material, for example, a JIS hardness tester A type 70-
It is made of rubber material having a hardness of 90 °, and has an annular section 6 having an elliptical cross section, blades 7 integrally formed on the annular section 6 at intervals of about 40 ° in the circumferential direction, and a circumference between each blade 7. Three lugs 8 are equally arranged in the direction and integrally formed with the annular portion 6.

The blades 7 are mainly for obtaining a strong traction force and an upward reaction force (buoyancy) during forward rotation, and have an inclination angle θ with respect to the centripetal line α of the wheel body 5 in a front view. The radially inner end portion 7a precedes the radially outer end portion during forward movement, and is formed into a substantially quadrangular shape so as to project radially outward along the entire circumference of the annular portion 6 in the radial cross-sectional view of the wheel body 5. Therefore, the rigidity is smaller than that of the lug 8.

The inner peripheral surface 5a of the annular portion 6 and the leading side surface of the radial inner end portion 7a of the blade 7 intersect at an acute angle to form a triangular corner portion.
In the present invention, the watershed portion 10 is formed at this portion. The watershed portion 10 is a triangular plate-shaped rubber film along the center line of the annular portion 6, which is integrally formed with the annular portion 6 and the blades 7, and divides the mud to be collected in the triangular corner portion into left and right parts. Adhesion is reduced to facilitate removal.

The water ridge portion 10 is located at a right angle to the leading side surface of the blade 7, and has a wall thickness of about 3 to 7 mm, and is formed to have the same thickness over the entire area or a thickness at which the root portion of the annular portion 6 and the blade 7 gradually increases. Has been done. If the wall thickness of the watershed ridge portion 10 is 3 mm or less, there arises a problem in strength, but even if it is 7 mm or more, the effect does not change and it can be carried out. However, if the thickness is too thick, the elasticity of the blade 7 is impaired, so the upper limit of the wall thickness of the watershed portion 10 is determined in relation to the elasticity of the blade 7. In addition, R at the root portion is formed to have a large diameter to prevent the accumulation of mud.

Further, the ridgeline of the watershed portion 10 has, in addition to the linear shape as shown in FIG. 1, a concave arc shape as shown by the solid line in FIG. 6 or a convex arc shape as shown by the phantom line in FIG. Things etc. can be adopted.

Both side portions 13 protruding laterally from the annular portion 6 of the blade 7
As is clear from FIGS. 2 and 5, the root portion on the annular portion 6 side is
13A is thicker than the tip 13B, and the middle is a step
It is 13C. The tip portion 13B is flexible, and when it is in the mud, it is elastically deformed by the resistance from the mud so as to be on the trailing side of the root portion 13A, that is, as shown by the imaginary line in FIG. 5, and comes out of the mud. At this time, when the resistance from the mud is released, the state of the solid line in FIG. 5 is restored, and the attached mud is removed. It is possible to drop the mud over the entire width of the blade 7 only by causing the mud-dispelling action to occur at both tip portions 13B. Such a configuration is also adopted on the radially inner end portion 7a side of the blade 7 and has the same effect.

The lug 8 is for obtaining a traction force and a reaction force in the upward direction similarly to the blade 7, and has a substantially trapezoidal shape in a side view, a laterally long octagonal shape in a plan view, and is integrally projected from the annular portion 6 in a radially outward direction, The contact surface 15 is located on the same circumference as the contact surface 12 of the blade 7, and the circumferential length is longer than the contact surface 12.

The mutual distance P between the lugs 8 and the distance P between the vanes 7 are formed to be substantially the same, and are configured to reduce vibrations during traveling on the road. Shallow recesses 16 are formed on both sides of each lug 8 to facilitate elastic deformation in the compression direction, which absorbs and alleviates impact at the time of ground contact and reduces vibration.

(Effect of the Invention) According to the present invention, since the triangular space formed between the inner diameter end portion of the blade and the inner peripheral surface of the annular portion is closed by the water ridge portion,
The clogging of mud is prevented, and since the tip of the blade is formed at the thin tip through the step, vibration of the tip is facilitated and adhesion of mud is prevented.

Further, since the inner diameter end is divided into the right and left by the watershed, the left and right vibrations thereof are different via the watershed, so that the mud can be easily removed and the accumulation of the mud can be prevented.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention. FIG. 1 is a front view of a main part, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a front view showing the whole. 4, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, FIG. 5 is a view in the direction of arrow V in FIG. 3, FIG. 6 is a front view showing a modified example of the watershed portion, and FIG. It is a front view shown. 6 ... annular part, 7 ... blade, 7a ... inner diameter end, 8 ... lug, 10 ... ridge, α ... centripetal line, θ ... tilt angle,
13 …… Both sides, 13A …… Root, 13B …… Tip, 13C…
… Steps.

Claims (1)

[Scope of utility model registration request] 1. An annular portion (6) made of an elastic body has lugs (8) and blades (7) at predetermined intervals in the circumferential direction, and the blade (7) has a radially inner end portion (7a) at the time of forward movement. Has an inclination angle (θ) with respect to the centripetal line (α) of the annular portion (6) so as to precede the radially outer end portion,
And in the agricultural wheel in which the radial inner end portion (7a) of the blade (7) projects radially inward from the inner circumference of the annular portion (6), the inner circumferential surface (5a) of the annular portion (6) and A watershed ridge (10) is formed between the protruding radial inner end (7a) of the radial inner end (7a) in the rotational direction, and the ridgeline of the watershed (10) is the ridgeline of the blade (7). Both sides that are formed in a smooth mountain shape that is substantially orthogonal to the inclination and that project laterally from the annular portion (6) of the blade (7).
(13) and the radially inner end portion (7a) protruding inwardly are thicker than the root portion (13A) and the root portion (13A) on the side of the annular portion, and more than the root portion (13A). The outer tip (13B) and the tip (1
3B) and the step (13C) formed at the boundary between the root (13A)
And the watershed portion (10) is a root portion (13A) of the radial inner end portion (7a).
The agricultural wheel is provided over the entire length from the tip to the tip of the tip portion (13B), and divides the radial inner end portion (7a) into left and right parts.