JPH04283180A - Endless joint structure for rubber crawler belt - Google Patents

Abstract

PURPOSE:To prevent vibration of an endless joint part by butting steel cord trains, extending from the two ends of the endless joint part, against each other and embedding a stripform doubling plate at the butted part and in a rubber resilient body in a state to correspond to the core 3. CONSTITUTION:A rubber crawler belt is continued in the lateral direction of a resilient body 1, steel cords 2 have two ends 21 and 22 butted against each other in a state to front on a core 3. A doubling plate 5 made of a metal is welded facing the core 3 and embedded in a rubber resilient body in a state to hold the above state. As noted above, by processing the butted parts of the steel cord ends 21 and 22, an accident wherein the end part is protruded from the resilient body 1 can be prevented from occurring, and a tensile strength is also held. Further, Since structure wherein only one steel cord train is present between the cores 3 is provided, a rugged feeling owing to a difference in rigidity between the cores 3 during winding of a sprocket and an idler is entirely not produced.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endless joint structure for a rubber crawler, and more particularly to a joint structure that allows smooth winding around a sprocket or idler.

0002

2. Description of the Related Art In recent years, rubber crawlers have come into widespread use in place of iron shoe crawlers. This is because conventional iron shoe crawlers have the drawback that vibrations caused by uneven running surfaces are directly transmitted to the occupants, and furthermore, it has been pointed out that they can damage the paved road surface when running. It has replaced the advantageous rubber crawler. That is, since the rubber crawler is entirely made of rubber elastic material, it has characteristics such as less vibration to the occupants and no damage to the paved road surface.

[0003] Such rubber crawlers are generally formed into a belt-like elongated body, and the ends are vulcanized and molded again to make it endless. However, in order to ensure tensile strength in the longitudinal direction of the rubber crawler, steel cords are embedded in rows, and in the endless joint section described above, such steel cords are buried. It is common to embed the card rows in rubber in an overlapping manner.

FIG. 9 is a schematic side view showing the endless joint portion of such a rubber crawler. That is, in a rubber crawler, a steel cord 2 is placed in the rubber elastic body 1 in advance except for the endless joint part (A).
The joint part (A) is made by embedding steel cords 21 and 22 extending from both ends.
The rubber in these parts is then vulcanized again in an overlapping state.

However, as shown in the figure, in the endless joint part (A), the steel cords 2 overlap, so this part (A) is It has higher rigidity than the other parts, and the winding around the sprocket and idler is not smooth, causing rough vibrations. Furthermore, there are cases in which the tip of the steel cord 2 breaks through the rubber elastic body 1 and protrudes from the outer surface, and improvements have been required in terms of durability. In the figure, numeral 3 indicates a core metal embedded in the rubber elastic body 1, and numeral 4 indicates a lug formed on the outer surface of the rubber elastic body 1.

[0006]

[Problems to be Solved by the Invention] It is an object of the present invention to solve the drawbacks of the prior art, and to prevent rough vibrations in the endless joint and protrusion of the steel cord from the surface of the rubber elastic body. It is said that

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention employs the following configuration. That is, the gist of the present invention is that steel cords are buried in rows along the longitudinal direction of a rubber elastic body forming a rubber crawler, and a short fence-shaped core metal is installed inside the steel cords. Rubber crawlers are buried side by side at a constant pitch, and at the endless joint where both ends of the rubber elastic body butt, the rows of steel cords extending from both ends are butted on the core metal, and this butt is formed. A rubber crawler characterized by having a short fence-like splice embedded in a rubber elastic body to match the core metal.
It is preferably an endless joint structure with a pitch of at least two core metals at both ends of the rubber elastic body, and a steel extending from both ends.
The present invention relates to an endless joint structure for a rubber crawler in which rows of rubber cords are butted against each other with a step difference on the two or more core metals. The splint used here is a metal plate, a plastic plate, or an unvulcanized rubber plate embedded with steel cord rows.
It is also possible to fill the space between the core metal and the splicing plate at the abutting portion of the board with, for example, an epoxy resin as an adhesive.

[0008]

[Function] The present invention is applied to the endless joint of a rubber crawler, in order to eliminate the defects caused by overlapping steel cords, the steel cords are butted together on a core metal and a splint is attached from above. The steel cord between the core metals should not overlap over the entire circumference of the rubber crawler, and the tip should preferably protrude from the rubber elastic body. When wrapped around a sprocket or idler, there is no vibration and smooth rotation is achieved.

[0009]

[Specific Examples] The present invention will be explained in more detail below using specific examples. FIG. 1 is a longitudinal cross-sectional view of a rubber crawler of an endless joint according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view in the width direction. In the figure, reference numeral 1 denotes a rubber elastic body, and the rubber crawler is continuous in the left and right direction. Further, 2 is a steel cord, and both ends 21 and 22 of the steel cord 2 are brought together facing the core metal 3. A metal splicing plate 5 is placed in contact with the core metal 3 and is buried in the rubber elastic body 1 while maintaining this state. Here, in particular, the space between the core bar 3 and the splicing plate 5 was filled with epoxy resin surrounding the steel cord ends 21 and 22 to bond them together. In the figure, reference numeral 4 indicates a lug formed on the outer peripheral side of the rubber elastic body 1, and reference numeral 6 indicates a protrusion formed on the core metal 3. Further, the center portion 7 of the core metal 3 is an engaging portion with a sprocket (not shown).

In this way, the steel cord ends 21 and 22
By treating the abutting portions, it is possible to prevent the accidental protrusion of the ends from the rubber elastic body, and it is also possible to maintain tensile strength. - Since the structure has only one row of codes,
When the sprocket or idler is wound around, there is no lumpy feeling due to the difference in rigidity between the core metals, and the vibration caused by this is eliminated.

FIG. 3 is a longitudinal cross-sectional view of a rubber crawler of an endless joint according to a second embodiment of the present invention, and is an example in which the cross section of the core metal 3 is an inverted trapezoid. In this case, the steel cord ends 21 and 22 are mated within the flat part 30 of the core bar 3, and the splice plate 5 is attached to the flat part 30 of the core bar 3.
The width W is about the same as that of 0.

FIGS. 4 to 8 below show embodiments 3 to 8 of the present invention.
Both ends 21 and 22 of the core metal 3 and the steel cord 2 of the endless joint part of the rubber crawler in the seventh embodiment
FIG. 2 is a conceptual diagram showing the relationship between the two parts and the splicing plate 5.

FIG. 4 shows a third embodiment of the present invention, in which two core metals 31 and 32 form an endless joint, and two steel cord rows ( S1, S2) are arranged, and the steel cord ends 21, 22 of each row are connected to the core bars 31, 32 with a step.
The core metal 31 has a short splint 51, and the core metal 32 has a long splint 52.
will be added. In this way, steel coat
By providing a step at the end of the rubber track, the rigidity of the rubber crawler can be made even more uniform.

FIG. 5 shows a fourth embodiment of the present invention, in which the endless joint portion is formed by three core metals 31, 32, 33.
The steel cord rows S1, S
2 are abutted with two steps, and splints 51, 52, 53 are long enough to cover the respective abutting portions.
is attached and embedded in the rubber elastic body. It should be noted that one steel cord end 22 is omitted in this figure, and the same applies hereafter up to FIG. 8. In this way, by increasing the number of core metals forming the endless joint part, it is possible to increase the number of stepped parts.

FIG. 6 shows a fifth embodiment of the present invention, in which two core metals 31 and 32 forming an endless joint are used.
The left and right steel cord rows S1 and S2 are brought together in a zigzag step.

FIG. 7 shows a sixth embodiment of the present invention, in which there are three core metals 31 and 32 forming the endless joint part.
, 33, but the steel cord strings S1, S2
The stepped portion is made by skipping one core metal. In this case, the splints 51 and 53 only need to be used at the butting steps, and since the splints are not concentrated in one place but are distributed, the rigidity of the rubber crawler as a whole can be made uniform. be.

FIG. 8 shows a seventh embodiment of the present invention, and FIG.
In the steel cord rows S1 and S2, S
This is an example of reversing the relationship in 1, and the overall steel
This is a case where the abutting portions of the code rows S1 and S2 are asymmetrical on the left and right sides.

[0018] In the rubber crawler of the present invention, there can be two or more endless joints, and the splints can be of different sizes as shown in the figure, or they can be the same. You can use the dimensions,
Can be used case by case.

[0019]

[Effect] The present invention has an endless joint part as described above, and since a splint is attached to the joint part on the core metal, tensile strength can be ensured, and the steel cord end This rubber crawler has improved durability and no spring-up. In particular, by eliminating the overlapping portion of the steel cord between the core metals, the rigidity of the rubber crawler as a whole is made more uniform, which eliminates the rugged feeling and improves passenger comfort. This provides a rubber crawler with good riding comfort.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a rubber crawler of an endless joint according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view in the width direction in FIG. 1;

FIG. 3 is a longitudinal sectional view of a rubber crawler of an endless joint according to a second embodiment of the present invention.

FIG. 4 is a conceptual plan view of an endless joint portion according to a third embodiment of the present invention.

FIG. 5 is a conceptual plan view of an endless joint portion according to a fourth embodiment of the present invention.

FIG. 6 is a conceptual plan view of an endless joint portion according to a fifth embodiment of the present invention.

FIG. 7 is a conceptual plan view of an endless joint portion according to a sixth embodiment of the present invention.

FIG. 8 is a conceptual plan view of an endless joint portion according to a seventh embodiment of the present invention.

FIG. 9 is a conceptual side view showing a conventional endless joint part.

[Explanation of symbols]

A...Endless joint part S1, S2...Steel cord row 1. Rubber elastic body 2.Steel cord 21, 22...Steel cord end 3, 31, 32, 33... Core metal 4. Rag 5, 51, 52, 53...Plate 6.Protrusion 7. Engagement part with sprocket

Claims (5)

[Claims] Claim 1: Steel cords are buried in rows along the longitudinal direction of the rubber elastic body forming the rubber crawler, and short fence-like core metals are installed at a constant pitch inside the steel cords. In this rubber crawler, which is buried side by side in the An endless joint structure for a rubber crawler characterized by a short fence-like splice plate embedded in a rubber elastic body to match the core metal. 2. A claim in which the pitch of at least two core metals at both ends of the rubber elastic body constitutes an endless joint, and the steel cord rows extending from both ends are butted with a step difference on the two or more core metals. Endless joint structure of the rubber crawler according to item 1. 3. The endless joint structure for a rubber crawler according to claim 1, wherein the splicing plate is a metal plate, a plastic plate, or an unvulcanized rubber plate in which a row of steel cords is embedded. 4. The endless joint structure for a rubber crawler according to claim 1, wherein an adhesive is filled between the core metal and the splicing plate at the abutting portion of the steel cord. 5. The endless joint structure of a rubber crawler according to claim 4, wherein the adhesive is an epoxy resin.