JPH0331077A - Manufacture of edge cut-preventing rubber crawler - Google Patents

Abstract

PURPOSE:To prevent a steel cord in an edge part from being forced out to the outside from a cavity at the time of molding by providing forced out- preventing pins on upper and lower mating surfaces of a long mold of the rubber crawler in the title in which the steel cord is embedded to both side ends in a width direction inside a crawler main unit. CONSTITUTION:In an edge cut-preventing rubber crawler 1', an edge part 7 is reinforced by embedding a steel cord 5 almost to the side end of a crawler main unit 2. When the rubber crawler 1', thus constituted, is molded by using upper and lower molds 10a and 10b, forced out-preventing pins 17... are provided in a mold-mating surface 11a so that inner side surfaces 17t are positioned in the inner side from a side surface 12a of a cavity 12 between the upper and lower molds 10a and 10b. Pin holes 18 for fitting the forced out-preventing pins 17 are drilled in a lower mold-mating surface 11b corresponding to these forced out-preventing pins 17. In this way, the steel cord 5, positioned on the side end in the cavity 12, is prevented from being forced out to the outside from the cavity 12, during the time of pressure-clamping a long mold.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a rubber crawler attached to mobile agricultural machinery or construction machinery, etc. A method of manufacturing a rubber cloak with steel cord embedded up to both sides in the width direction.

(Prior Art) Figures 1 (A) and CB) show a conventional rubber crawler 1. Figure 1 (A) is a cross-sectional view in the width direction, and Figure 1 (B) is a plan view of the non-board side. The two wing parts 8', 8' of the core metal 3 buried inside the crawler body 2 are grounded 1) 1) A large number of steel cords 5 are lined up in the width direction and are buried so that they can be pulled and gripped in the circumferential direction. .

(Problem to be Solved by the Invention) In FIGS. 1(A) and (B), the so-called ear portion 7 extending from the side end of the wing portion 3' of the core bar 8 to one end of the shift loft main body 2 is visible. Ear cut N9 may occur and grow due to riding on a crushed stone, stepping on a crushed stone, or being pushed strongly against an obstacle, causing a part of the ear 7 to break off and fall off. In the figure, 81 is a core protrusion, 6 is a lug, and 8 is a sprocket engagement hole.

Figures 2 (A), (B), and (C) show the edge cut prevention rubber crawler 1), where (A) is a cross-sectional view in the width direction, and (B) is a plan view of the non-ground side. (C) is CB)
1f? As for the size of the figure, the Klorane body 2 is hot.
Since the steel cord 5 is buried up to I@ and the ear portion 7t is reinforced, ear breakage is effectively prevented, but on the other hand, the steel cord 5 located on the K during the molding process of rubber crawler 1'
[Protruding spots 9 often occur.]

FIGS. 8(A) and 8(B) explain the manufacturing process of the rubber flora lI. 1
2, core metal 3, steel cord 5 and end 7IO sulfur rubber 1
3, etc. are placed, the mold is clamped under pressure from above and below, and then heated for the entire prescribed period of time. At this time, the amount of unvulcanized rubber 18 is slightly excessive.

Figure 3 (B) shows the state just before mold clamping.
The core metal 8 and the steel cord 5 are fixed at a predetermined position inside the cavity 12, and the unvulcanized rubber 13 flows and fills the remaining space.

In the same figure, 10 is a long mold consisting of an upper mold 10' and a lower mold 1Ob, 14 is the four parts drilled in order to form the pufferfish 6 in the cavity 12, and 15 is a core metal protrusion 3 in the cavity 12. ``Four parts are drilled to fix the fitting, 1) the upper mold matching surface 1) g and the lower mold meeting surface 1
) The upper and lower mating surfaces that match b are formed.

Figure 4 (A) and (B) Rubber crawler 1 to prevent ear breakage
), and this figure (A) is the same as the above-mentioned figure 8 (A).

FIG. 4(B) shows the state immediately before the mold clamping, and in this case, the inside of the pad 16 protruding between the upper mold mating surface 1) and the lower mold mating surface 1) b is shown. Steel cord 5 often turns out to be empty, so 6
9. In this way, since the steel cord is removed together with the cord, the steel cord is removed and the part where the steel cord is removed is not protected against ear cutting. Because the sides of the product are exposed, there is a risk of injury when handling.

(Means for Solving the Problems) The present invention is intended to solve the above-mentioned problems. In the cavity, the core metals are arranged at intervals of one foot in the length direction, and a large number of steel cords are pulled in the direction of width and arranged horizontally in a width direction, and the core metals and the steel cords are After arranging the vulcanized rubber appropriately to fill the cavity and all other cavities, pressurized clamps are applied from the top and bottom of the long mold, followed by mPp: for a predetermined period of time, and an ear trap steel cord is attached inside the cavity. 'f: fl
When manufacturing a rubber crawler to form a crawler body, a protrusion prevention pin whose inner im surface is located inside the cavity is lengthened with respect to the mating surfaces on the same lengthwise side or both sides of the long mold. Install them at appropriate intervals in the horizontal direction, and drill a bottle hole at the same distance as the extrusion prevention pin! 1)! It is in the point of giving.

(Function) At the alignment of the radial direction drawing side of the long mold, P'3i
Extrusion prevention pins with the lIJ surface located inside the cavity were arranged and protruded at appropriate intervals in the longitudinal direction, so that when the long mold was pressurized and clamped, the steel cord located at the ml end inside the CFld cavity was not exposed to the outside of the cavity. They will be prevented from leaving, and will therefore be prevented from entering Paris and entering the enclosure.

The invention will be specifically explained using the following example.

(Embodiment) Figure 5 CA), CB) and (,
) is the cross-sectional view, and the test drawing is the upper mold matching tiaK.
The inner surface 17j of the protrusion prevention pin 17 is inserted into the cavity 12.
A pin hole 18 is provided in the lower mold meeting surface 1) 6 corresponding to the extrusion prevention pin 17 to allow the extrusion prevention pin 17 to be inserted. Incidentally, reference numeral 19 denotes a notch provided to form a ten-piece retaining hole 8 in the cavity 12.

Figure 5 CB) Plan view of μ long mold 10', same figure CO
) is a YY cross-sectional view of (B), and since the protrusion prevention pins 17 are provided at appropriate intervals on both sides of the long mold lO' in the length direction, 69, in the non-example, the recesses 14, 14.
Place it between the two. This buried field is the recess 14
Since the upper and lower thicknesses inside the cavity 12 are large, there is only a small amount of bulge 16 protruding from both sides rC of this part.
Therefore, protrusion of the steel cord 5 is relatively unlikely to occur, whereas the cavity 1 between the four parts i4 and 14
The top and bottom thickness inside 2 is small, and there is a paris 1 on both sides of this part.
This is because the steel cord 5 is likely to protrude because the electric current 6 is generated relatively frequently. FIG. 6 shows the state immediately before mold clamping in the manufacturing process using the long mold 101, and in this case, the inner surface 17t of the extrusion prevention pin 17 is provided so as to be located inside the cavity 12. Therefore, the steel cord 5 at the ear part does not protrude beyond the cavity 12. *In 4A, the distance l between 17I and the cavity side surface 121 is approximately 4u or more, but it may vary depending on the shape of the crawler body 2 and ear 7 or the buried position of the steel cord 5. Shiren Hui Vc is set. In addition, the steel cords 5 to be buried in the ground 1i1) J of the core metal wing ♂ are made by arranging a large number of relatively small-diameter steel cords horizontally to make the total area facing the core metal wing as large as possible. If the steel cord 5 buried in the hole 7' is relatively large in diameter, it will have an effect of preventing edge breakage. Since the distance 171 is located inside the cavity 12 at a distance MIJ from the cavity side surface 12a, it is located at a concave portion formed at the side end of the crawler body 2.

It is not limited to the position of the roof, the position of the protrusion prevention pin, or between the lugs, but may occur due to relatively high electricity levels in Paris, depending on the shape of the crawler body 2 and ear part 7, or the position of the steel cord 5. A suitable interval rc is provided for the position.

In addition, in the above embodiment, the extrusion prevention pins were provided on both sides of the μ long mold in the length direction, but it is also possible to provide only one side r(*) if necessary. It is within the scope of the present invention.

(Effects of the Invention) As described above, the present invention relates to #4, and since the upper and lower mating surfaces of the elongated mold are provided so that the inner surface of the extrusion prevention pin is located within the cavity, the ear portion The steel cord will not protrude beyond the cavity and therefore will not enter the Paris.
The steel cord is removed together with the splint, so there is no open space, and the entire circumference of the cloak body has an excellent effect of preventing ears from being cut. Also, the cut part of the steel cord is not exposed on the even side of the cloak body. This is because KgAW will not be generated when handling as a collection.

[Brief explanation of drawings]

Figure M1 shows a conventional rubber crawler, where A is a sectional view in the middle direction, B is a plan view of the non-contact surface side, and Figure M2 shows a conventional rubber crawler that prevents edge breakage, where A is a sectional view in the width direction, and B is a cross-sectional view in the width direction. is the non-ground side plan view, cHBox-xmrm diagram, Figure 8A,
B and FIG. 4 A% B show the manufacturing process of the rubber crawler, and FIG. 5 A and B% C show the long mold according to the present invention. In the figures, C is a YY cross-sectional view of B, FIG. 6 is a view of the product in use, and FIG. 7 is a perspective view of the product. l...Rubber crawler 1)...Rubber crawler to prevent ear breakage 2...Cloaf body 3...Core metal 8'...Core metal wing portion 31...
Core protrusion 5...Steel cord 6/e-plug 7
... Ear part 8 ... Sprocket 1 matching hole 9
...Ear cut lO...Long mold 10'...
- Long mold 10a according to the present invention... Upper mold 10
&...Lower mold No. 7Il Meeting surrounding upper mold mating surface 1) -...Lower mold mating surface cavity 12g...Cavity side end ZJI sulfur A Recessed part for forming a lug Fixing the core metal protrusion Four-part burr 17... Inner surface of pin to prevent extrusion 18... Inner surface of protrusion for forming pin hole sprocket retaining hole 1) 1)
Distance between J17I and cavity $1) 1fl12a Distance between clove body 2 11@rCm When the recess is formed, M person Fukuyama Rubber Industries Co., Ltd. construction drawings Fig. 3 Fig. b Fig. 6 WJ Procedural amendment No. 7 Fig. 2, Name of the invention: Sea bream katafu of rubber cloves to prevent ear breakage Relationship with the case of the person making the amendment Patent solicitor 4, agent address: Fukuyama City 1) 1) 1) fz arrival No. 6 Mr. Bill Yamaba
Name W! s # # Xu Office 7
, Correction target l no waiting + f'FaF1) Water I&L1) dRetrospective correction of the attached sheet. 2) Add the following words on page 9, Kitake'lc. "Also, the enclosing shape a circle r C limit length n of the overflow prevention bottle
It is not limited to μ and can be of any shape. '' The above is the range of the upper mold and the inner side of the charcoal bar where r' = 9. In order to fill the space between the steel cords of the S and other stations, the bore 13 machine comb is self-aligned across the length of the trap ribbon and the long mold. Up and down!l
) AJ pressure mold tightening purple, enter for a specified time 771. I heat purple, and inside the cap, the ear part ζ is set with 4 steel cords to form a crawler body τ. The middle steel cord is inside the cavity = 9 is the center of the Paris (in order to prevent △t, the long mold is rounded from the -T side or both sides from the V). On the other hand, μ + - spill prevention bottles whose inward side is located inside the cavity are installed in parallel with the pressure width lζ in the lengthwise direction, and the spoiled round I (bin Hole C is drilled and the gun is fired at this point, where the 2'L ear-cutting rubber crawler is loaded with power.

Claims (1)

[Claims] (1) In a cavity formed on the inner surface of a long mold consisting of an upper mold and a lower mold, a large number of core metals are arranged side by side at regular intervals in the length direction, and a large number of steel cords are pulled in the length direction. aligned, and arranged horizontally to almost the side edges in the width direction,
After vulcanized rubber is appropriately placed to fill the space between the core metal and the steel cord and other spaces, the elongated mold is clamped under pressure from above and below, and then heated for a predetermined period of time to form an ear inside the cavity. In a method of manufacturing a rubber crawler that prevents edges from breaking, in which a crawler body is formed with a steel cord embedded in the part thereof, the steel cord is prevented from protruding from the inside of the cavity and entering the burr while the long mold is being clamped under pressure. Manufacturing of a rubber crawler to prevent edge breakage, characterized in that the long mold is protruded at appropriate intervals in the longitudinal direction, and pin holes are bored in the mating surface corresponding to the extrusion prevention pins. Method