JPH0223442Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an agricultural wheel used mainly as a support wheel of an agricultural working machine such as a seeding machine or a fertilizer applicator.

(Prior art) Conventional wheels of this type include those in which a hollow tire is sandwiched or fixed to the wheel (for example,
-144104 Publication), iron wheels without tires, and iron wheels coated with rubber (for example, Utility Model Publication No. 144104).
2622).

(Problem that the invention aims to solve) The tires and wheels are diverted from those used in tillers, and are for relatively light loads, with a maximum load of 100
~250Kg/one tree, and when used in a seeding machine etc., a load of around 500~600Kg/one tree is applied, resulting in abnormally large deflections, extremely short tire life, and increased tire replacement frequency. It costs a lot of money. Further, when the tire is pneumatic, there are problems such as a large number of parts, complicated manufacturing and assembly, and troublesome management of air pressure.

In the case of iron wheels, which can be used at a low cost, there is a problem in that they generate severe vibration and noise, and the field performance deteriorates.

Therefore, as shown in FIG. 5, a rubber member 18 that will become a tire is baked onto the outer peripheral surface 7 of the annular core metal 5 fixed to the spokes 4. However, with this technology, since the left and right side surfaces 8, 9 and the inner circumferential surface 6 of the core metal 5 are exposed to the outside, rust is likely to occur, and when rust occurs, it spreads to the outer circumferential surface 7, and the rubber member 18 and It will penetrate into the adhesive surface and cause peeling. In addition, the left and right side surfaces 8 and 9 may be deformed by impact due to stones, road steps, etc., and this may also cause separation. This problem can be solved by surrounding the inner and outer circumferential surfaces and left and right side surfaces of the core metal with rubber members, as shown in French Patent No. 1393592. The rubber wall on the circumferential surface is very thick, and is larger than the width.The large amount of rubber increases the cost, and the large amount of compressive deformation of the rubber makes the wheels unusable. Other problems arise, such as stability.

However, in the prior art, the problem cannot be solved simply by reducing the thickness of the tread portion of the rubber member. That is, reducing the thickness of the tread portion reduces costs and improves running stability, but conversely increases vibration.

Furthermore, the lugs of the prior art are either vane-shaped or block-shaped, and are designed with emphasis only on generating traction force, with little consideration given to straight-line performance during running.

(Means for Solving the Problems) The present invention is to form a plate ring shape by fixing and surrounding a relatively thin rubber member around the entire circumferential surface of the core metal, and attaching a peripheral portion to a lug protruding from the tread portion. By forming the side long portions, all of the problems of the prior art described above can be solved.

That is, the specific configuration of the problem solving means in the present invention is such that a thin annular core metal 5 is fixed to a core support member 4, and the inner and outer circumferential surfaces and left and right side surfaces of the core metal 5 are firmly surrounded by rubber members 11. In an agricultural wheel in which a large number of lugs 10 are set on the outer periphery of a tread portion 14 of a rubber member 11, the rubber member 11 that encloses the core metal 5 has a plate ring shape with a thickness smaller than its width, and the lugs 10 have a tread portion 14. The portion 14 has a plurality of circumferential portions A formed at equal intervals in the circumferential direction approximately at the center in the width direction of the portion 14, and side length portions B extending outward from each of the circumferential portions A.

(Function) The rubber member 11 containing the core metal 5 has a wall thickness sufficiently smaller than the width, is formed in the shape of a plate ring, has a small rubber mass, and ensures stable running.
Vibrations are absorbed by the lugs 10 protruding from. In the lug 10, a large number of circumferential portions A formed at equal intervals in the circumferential direction on the tread portion 14 improve straight running performance and reduce vibration, and the circumferential portions A and side portions B generate traction force.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In the first embodiment shown in FIGS. 1 to 3,
The agricultural wheel 1 has four spokes 4 fixed to the flange portion 3 of the mounting member 2, and the outer ends of the spokes 4 are welded to the inner circumferential surface 6 of the annular core metal 5. 6, 7 and left and right sides 8, 9, lug 10
It is surrounded by a rubber member 11 having a diameter.

The mounting member 2 can be fitted and mounted on the axle of a seeding machine or a fertilizer applicator, etc., and has a fitting hole 12 and a bolt hole 1.
3 is formed, and the flange portion 3 on the outer periphery is formed in the shape of a truncated cone.

The spokes 4 are formed of pipes, and the flange portions 3
It is welded at right angles to the This spoke 4
may be multiple numbers other than four.

The core metal 5 is formed by cutting a large-diameter pipe into rings, or by rolling a band plate and welding its ends, and its cross-sectional shape is rectangular, that is, it becomes a band-shaped thin plate annular body. and the core metal width W is the wall thickness T.
It is set to about 10 to 40 times. This ratio of width W to wall thickness T will change depending on the applied load or required ground pressure, but it needs to be within the range of at least 5 to 50 times, and it is necessary to be 5 times or less. It is difficult to obtain a suitable ground pressure, and if it exceeds 50 times, it becomes unstable in strength or tends to cause manufacturing problems.

The rubber member 11 is made of only rubber or rubber mixed with short fibers, and has elasticity and flexibility. This rubber member 11 covers the entire surface of the core metal 5 and the connecting portion between the core metal 5 and the spokes 4 and is firmly baked and bonded to it, almost completely preventing rust from forming on the entire surface of the core metal 5. and the outer peripheral surface 7
The left and right side surfaces 8 and 9 are protected from deformation due to direct contact with stones, steps, etc.

The rubber member 11 is set to have a wall thickness sufficient for the expected load, and reliably buffers the impact from stones or steps, and transmits the impact that would cause deformation to the core metal 5. In addition, the rubber usage cost is set to be kept sufficiently low.

For example, if the set load is 600Kg/piece, the core metal 5
The outer diameter of the rubber member 11 is 430 mm, the outer diameter of the tread portion 14 is 430 mm, the width is 110 mm.
It is becoming.

As shown in FIG. 3, the rubber member 11 has a tread portion 14 that is thicker than the thickness of the core metal on the outer peripheral surface of the core metal 5. It covers the left and right side parts of 5 and extends to the inner peripheral surface of the core metal, and on this inner peripheral surface side, the rubber inner peripheral part 2
1 is formed. Since this rubber inner peripheral portion 21 is not in contact with the ground, it does not need to be as thick as the tread portion 14, and may be made approximately the same thickness as the core bar 5, for example, as shown in FIG.

The rubber member 11 further includes an extension portion 22 on the rubber inner peripheral portion 21 that covers the outer diameter portion of the core support member 4.
is formed to protrude in the radial direction. Rubber member 1
1 is formed thin except for the tread portion 14, and prevents the outer diameter portions of the core metal 5 and the core support member 4 from being damaged by rust at a minimum cost. Therefore, the cross-sectional shape of the rubber member 11 containing the core metal 5 has a wall thickness that is sufficiently smaller than its width, and has a plate annular shape (a shape in which a plate is made into an annular shape).

Further, a large number of lugs 10 are integrally formed on the tread portion 14 of the rubber member 11 at regular intervals in the circumferential direction. This lug 10 has a circumferential part A at the center in the width direction of the tread, and a side part B extending from each circumferential part A to the opposite side. The side length portion B enables generation of traction force, soil removal, etc. In addition to the pattern shown in FIG. 2, various patterns such as a V-shaped pattern can be applied to the lug 10.

FIG. 4 shows a second embodiment, and this agricultural wheel 1' is a pressed product in which a boss part 15 is formed on the mounting member 2', and holes 16 are bored in the steel plate in the spokes 4'. There is. The core metal 5 and the rubber member 11 are the same as those in the first embodiment.

(Effects of the invention) According to the invention described in detail above, the rubber member 11 is firmly surrounded by the core metal 5 and formed into a plate ring shape whose wall thickness is smaller than its width, so that the cost does not increase too much. This eliminates the noise and rust caused by iron wheels, eliminates the complexity of manufacturing and management required by hollow tires, and improves running stability. Since the circumferential portions A are equally spaced in the circumferential direction and the side portions B extend outward from the circumferential portions, it is possible to generate sufficient traction force, prevent vibration from occurring, and improve straightness. I can do it.

[Brief explanation of drawings]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a front view, FIG. 2 is a plan view, and FIG.
The figure is a - line enlarged sectional view of Figure 1, and Figure 4 is a cross-sectional view of Figure 2.
A sectional view showing an embodiment, and FIG. 5 is a sectional view of a main part showing a conventional technique. DESCRIPTION OF SYMBOLS 1... Agricultural wheel, 2... Mounting member, 4... Spoke, 5... Annular core metal, 6... Inner circumferential surface, 7... Outer circumferential surface, 8... Left side, 9... Right side, 10 ... Lug, 11 ... Rubber member, 14 ... Tread portion,
W... Core metal width, T... Core metal thickness.

Claims (1)

[Scope of Claim for Utility Model Registration] A thin plate annular core 5 is fixed to the core support member 4, the inner and outer peripheral surfaces and left and right sides of the core 5 are fixedly surrounded by a rubber member 11, and the tread portion of the rubber member 11 is fixed. In an agricultural wheel having a large number of lugs 10 set on the outer periphery of the tread portion 14, the rubber member 11 containing the core metal 5 has a plate ring shape with a wall thickness smaller than the width, and the lugs 10 are arranged approximately in the width direction of the tread portion 14. An agricultural wheel characterized by having a plurality of circumferential portions A formed in the center at equal intervals in the circumferential direction, and side length portions B extending outward from each of the circumferential portions A.