JPH0761382A - Division type rubber crawler core and end part fixing structure of steel cord - Google Patents

Abstract

PURPOSE:To improve cut resistance and a tension rupture strength by a method wherein grooves are formed toward the obverse and the reverse of a plate-form blade part embedded in rubber and the end of a steel cord is fixed and the plate-form blade part is divided into inner and outer blade parts. CONSTITUTION:A core A comprises plate-form blade parts 1 formed on the right and the left side; a sprocket engaging part 2 formed at a central part, and corner parts 3 formed on both sides of the engaging part 2. Shafts 4 and grooves 41 formed at the right and left ends of the plate-form blade part 1 and a coupling fitment is attached thereto to form a division type rubber crawler. A groove 5 is formed in the plate-form blade part 1 throughout a range of from the obverse and the reverse, the plate-form blade part is divided into inner and outer blade parts 11 and 12, and steel cords are inserted in a row-form manner in a groove 5. A recessed difference in a level 12 are formed on the outer peripheral side of the inner blade part 11 and a recessed difference in a level 14 on the inner peripheral side of the outer blade part 12. This constitution improves the tension rupture strength of the end of the steel cord and prevents the damage of the steel cord when a rolling wheel passes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split type rubber crawler, and more particularly to an end fixing structure for a core metal and a steel cord used at the end of the split type rubber crawler.

[0002]

2. Description of the Related Art In recent years, rubber crawlers have come to be widely used not only in running parts of agricultural machinery but also in running parts of construction machinery. Such rubber crawlers reduce vibration and noise and damage the road surface. Of course, it can be said that it is preferable as a running unit. However, unlike the iron shoe crawler, the rubber crawler has some problems in cut resistance and the like, and has a drawback that the rubber crawler is easily scratched. Therefore, the endless rubber crawler has a problem that the entire rubber crawler is replaced if a part of it cannot be used.

For this reason, the rubber crawler is formed into a unit length, which is sequentially connected to form an endless split type rubber crawler.
LA is proposed. However, this split type rubber crawler has a problem in the structure of fixing the ends of the steel cord which bears the tensile tension applied to the rubber crawler, and the tensile breaking strength at the end of the steel cord is not sufficient, and it is put to practical use. Is having trouble.

[0004]

SUMMARY OF THE INVENTION The present invention is intended to solve the problems of the conventional split type rubber crawlers described above, and a cored bar and a stylus used at the ends of the split type rubber crawlers. The present invention relates to the improvement of the structure for fixing the end portion of the cord.

[0005]

The present invention adopts the following constitution in order to improve the problems of the above-mentioned conventional split type rubber crawlers. That is, the first gist of the present invention is
A cored bar embedded in the end of the split rubber crawler,
The flat blades embedded in the rubber are formed with grooves for inserting the steel cords in rows toward the front and back sides of the flat blades, and the flat blades are placed inside and outside the rubber crawler. It is characterized in that it is divided into wing parts, and preferably, in the inner wing part and the outer wing part divided by the groove, the inner wing part is recessed on the outer peripheral surface side of the rubber crawler. That is, the inner peripheral surface side is related to the core metal in which the outer wing portion has a concave step.

The second gist of the present invention is that the steel cords are fitted in rows toward the front and back of the flat blade portion of the cored bar embedded in the end portion of the split type rubber crawler. A groove to be inserted, the flat blade portion is divided into an inner blade portion and an outer blade portion with respect to the rubber crawler, and an inner peripheral surface of the rubber crawler is formed with respect to the groove formed in the flat blade portion. This is a structure for fixing the ends of the steel cord in which the ends of the steel cords are inserted in rows from the side and the outer blades of the rubber crawler are wound.

In the second aspect of the present invention, characteristically, steel cords are arranged in rows toward the front and back of the flat blade portion of the cored bar embedded in the end portion of the split type rubber crawler. Forming a groove into which the flat blade portion is fitted and dividing the flat blade portion into an inner blade portion and an outer blade portion with respect to the rubber crawler, and the rubber roller is fitted to the groove formed in the flat blade portion. After inserting the ends of the steel cords in a row from the inner peripheral surface side, the outer blades are rolled in and rotated by 270 degrees, and the steel cords are wound around the outer peripheral surface of the inner blades with the steal cord. -The present invention relates to a structure for fixing the end of a steel cord in which the ends of the cord are pressed.

[0008]

The present invention is characterized in that the core metal of the split type rubber crawler and the steel cord end fixing structure of the split type rubber crawler are embedded in the rubber. A steel coil that is a tensile member on the flat blade of the core
A groove for inserting the blade ends in a row is formed, and the flat blade portion is divided into an inner blade portion and an outer blade portion. This groove is usually formed toward the front and back of the flat blade, and includes a split groove, a slit and the like.

In order to use this cored bar in a structure for fixing the end of a steel cord, which will be described later, in the cored bar wing divided into the inside and the outside by the groove, the inner wing is dented on the outer peripheral surface side. Step
On the other hand, on the inner peripheral surface side, it is preferable to have a structure in which the outer blade portion is recessed to form a stepped portion. This is because it is arranged so as to be in contact with the outer wings.

On the other hand, in the steel cord end fixing structure, in terms of the steel cord side, the steel cord extends along the outer peripheral surface sides of the inner blade portion and the outer blade portion. , And surrounds the outer wing and faces the inner peripheral surface side, then is inserted into the groove from the inner peripheral surface side toward the outer peripheral surface side, and the tip of the steel code is located on the outer peripheral surface side of the inner wing portion. It was folded along. Therefore, the tip of the steel cord is sandwiched between the steel cord row and the outer peripheral surface of the inner blade portion,
The ends of the steel cord are firmly fixed.

[0011]

EXAMPLES The present invention will be described in more detail with reference to examples. 1 is a front view of a first embodiment A of a first core metal of the present invention, FIG. 2 is a plan view of the core metal of FIG. 1, and FIG. 3 is a side view thereof. In the core metal A, a flat plate-shaped wing portion 1 is formed on the left and right sides, a sprocket engaging portion 2 is formed in the center thereof, and corner portions 3 are formed on both sides of the engaging portion 2. The corner portion 3 projects from the inner peripheral surface of the rubber crawler and serves as an engaging portion with a wheel (not shown). Left and right ends of the flat blade portion 1, the shaft 4 and the grooves 4 ₁ of circular cross section is formed, wherein the connecting fitting 8 is mounted as shown in FIG. 4, for example, split type Gomukuro - what La is endless Is.

[0012] The flat blade portion 1 groove along its front and back (slit) 5 is formed, is divided into an inner blade portion 1 ₁ and the outer blade section 1 _2. A steel code (not shown) is inserted into the groove 5 in a row. As shown in FIG. 3, the outer peripheral surface of the inner blade portion 1 ₁ is a step 1 ₃ recessed slightly than that of the outer blade portion 1 ₂ is formed, whereas, the inner peripheral surface of the outer blade portion 1 ₂ recessed stepped 1 ₄ is formed. Each of these depressions step 1 _3, 1 _4, steel - Turkey - upon the de end fixing both steel - so that the de-column is located in this region - Turkey. In particular, even when the passage of such rolling wheel by forming a recessed step 1 ₄ steel - Turkey - without trauma occurs in de, whereas, by forming the recessed step 1 _3, steel - Turkey - de The end is pressed down, and a strong fixation is obtained.

FIG. 4 is a perspective view showing the metal fitting 8, which is provided with a pair of play holes 8 ₁ and 8 ₂ . The split Gomukuro - fitting a shaft 4, 4 formed on both ends of the arranged core metal across La herein, linked to fitted wheels 9 fastened in the groove 4 _first shaft 4, endless You will get the rubber crawler.

In addition, the inner blade ₁₁ and the outer blade 1 ₂
Turkey - In the face of de winds around, each of the co - Na - is preferably has a curved surface necessary, co in the inner blade portion 1 ₁ - na - curvature R _1, R ₂ relationship Is R ₁ > R
_2, co at the outer wing section 1 ₂ - Na - relation of curvature R _3, R ₄ of the good R _3> R _4. Incidentally, in this example, the outer blade portion 1 ₂ of the upper and lower co - Na - is have the same curvature (R _3), the outer blade portion 1 ₂ of the inner and outer co as shown in FIG. 5 -
It is also possible to change the curvatures of the corners R ₅ and R ₆ so that R ₆ > R
_It is preferable that ₅ > R ₄ . A corner with a small curvature is intended to be caught in a steel cord row, and a corner with a large curvature has a steel cord wound around it. It is to prevent disconnection.

The groove 5 formed in the flat blade portion 1 may be a split groove that divides the shaft 4 formed at the left and right ends of the flat blade portion 1 into two parts. It may be a groove formed obliquely above and below the wing portion 1.

FIG. 6 shows a second embodiment B of the first core metal of the present invention.
2 is a plan view showing the flat blade portion 1 having a slit-shaped groove 5 formed therein, and the flat blade portion 1 is provided with a bracket 6 for connection.

FIG. 7 is a cross-sectional view of the flat blade 1 of the core metal A showing the second fixing structure of the present invention using the core metal A shown in FIG. As can be seen in this figure, the steel code 10
End of the are bent inserted and moreover the rear of the inner blade portion 1 ₁ in the groove 5, while the steel - Turkey - de 10 extends rearwardly around the outer periphery of the outer blade portion 1 _2. Therefore,
Steel - Turkey - end of de 10 steel inside wings 1 ₁ of the outer peripheral surface side - firmly fixed sandwiched between de 10, Gomukuro - - Turkey to counter tensile force applied to La Will be possible.

8 to 10 are sectional views similar to FIG. 7 showing a second steel cord end fixing structure of the present invention. FIG. 8 is a view showing a stage in which the steel cord 10 is inserted into the groove 5 of the flat blade 1, and the steel cord 10 is inserted from the inner peripheral surface side.
Further, FIG. 9 is the outer blade portion 1 ₂ steel - is a view of a state of rotating the core metal 90 degrees while winding the de 10 - Turkey. Then, FIG. 10 is a view of a state further rotated by 90 degrees from FIG. 9, and is a state of being rotated 180 degrees from the initial state.
Then, by further rotating 90 degrees (270 degrees from the beginning), the fixing structure as shown in FIG. 7 is obtained.

The steel cord train is generally used with the surface thereof coated with unvulcanized rubber. When it is embedded in the rubber crawler, the fiber reinforcing member 7 is arranged on the inner peripheral side as shown in FIG. 7, or it is arranged between the blade portion and the steel cord, Depending on the case, it is possible to cover the steel code.

[0020]

The core metal of the present invention has a groove formed in its blade portion to fix the steel cord end, and therefore the drawbacks of the conventional split type rubber crawlers can be solved. is there.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment of a first core metal A of the present invention.

FIG. 2 is a plan view of a cored bar A shown in FIG.

FIG. 3 is a side view of the cored bar A of FIG.

FIG. 4 is a perspective view of a connecting fitting.

FIG. 5 is a cross-sectional view of a wing portion of a modified example of the first core metal A of the present invention.

FIG. 6 is a plan view of a second embodiment of the first core metal B of the present invention.

FIG. 7 is a cross-sectional view of a flat blade portion of a cored bar A showing a second aspect of the present invention using the cored bar A shown in FIG.

FIG. 8 is a cross-sectional view of a stage in which the steel cord is inserted into the groove of the flat blade using the core metal A.

FIG. 9 is a side view showing a state where the core metal A is rotated by 90 degrees while winding the steel cord around the outer wing portion.

10 is a cross-sectional view of the state of FIG. 8 rotated 180 degrees.

[Explanation of symbols]

A, B ‥‥ core _{metal, R 1, R 2, R} 3, R 4, R 5, R 6 ‥‥ wings of co - Na - curvature, 1 ‥‥ flat wings, 1 ₁ ‥‥ inner Wing part, 1 ₂・ ・ ・ Outer wing part, 1 ₃ , 1 ₄・ ・ ・ Dent step, 2 ・ ・ ・ Sprocket engaging part, 3 ・ ・ ・ Corner part, 4 ・ ・ ・ Shaft, 5 ・ ・ ・ Groove, 6 ・ ・ ・ Bracket, 7 ‥‥ fiber-reinforced member, 8 ‥‥ connecting fitting,遊孔provided in 8 _1, 8 ₂ ‥‥ connecting fitting, 9 ‥‥ snap ring, 10 ‥‥ steel - Turkey - de.

Claims (4)

[Claims] 1. A cored bar embedded in an end of a split type rubber crawler, in which steel cords are fitted in rows toward the front and back of a flat blade wing embedded in rubber. A cored bar having a groove formed therein, and the flat plate-shaped blade portion divided into an inner blade portion and an outer blade portion with respect to the rubber crawler. 2. An inner wing part and an outer wing part divided by a groove, wherein the inner wing part has a recessed step on the outer peripheral surface side of the rubber crawler, and the outer wing part has a recessed step on the inner peripheral surface side. The cored bar according to claim 1, wherein 3. Grooves into which steel cords are fitted in rows are formed toward the front and back of a flat blade portion of a cored bar embedded in an end portion of a split type rubber crawler, and the flat plate shape is formed. The wing portion is divided into an inner wing portion and an outer wing portion with respect to the rubber crawler, and a steel cord end is provided from the inner peripheral surface side of the rubber crawler with respect to the groove formed in the plate-shaped wing portion. A steel coil that is inserted in rows and has the outer wing of the rubber crawler rolled up.
Fixed end structure. 4. Grooves into which steel cords are fitted in rows are formed toward the front and back of a flat blade portion of a cored bar embedded in an end portion of a split type rubber crawler, and the flat plate shape is formed. The wing portion is divided into an inner wing portion and an outer wing portion with respect to the rubber crawler, and a steel cord end is provided from the inner peripheral surface side of the rubber crawler with respect to the groove formed in the plate-shaped wing portion. After being inserted in a row, the outer wing is rolled in and rotated 270 degrees, and the steel cord end is pressed by the steel cord wound around the outer peripheral surface of the inner wing. A steel cord end fixing structure.