JP6730105B2 - Rubber crawler - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rubber crawler used by being mounted on an endless track running device which is a suspension of a forestry work vehicle mainly in cold regions.

Conventionally, a rubber crawler has a plurality of endless rubber bodies, and a plurality of drive projections that are embedded side by side in the rubber body with a constant pitch in the circumferential direction and that are protruded toward the inner peripheral surface side of the rubber body. It has a structure including a cored bar and a plurality of rubber lugs protruding laterally on the outer peripheral surface side of the rubber body at a constant pitch in the circumferential direction (see Patent Document 1).

JP, 2005-205579, A

However, in the rubber crawler of the conventional example, since the lug contacting the running road surface is an elastic rubber material, when the running road surface is frozen in a mountain in a cold region, the rubber lug slips without biting into the frozen road surface. There was a problem that I could not drive.

An object of the present invention is to provide a rubber crawler that can travel even on a frozen road surface without slipping.

In order to solve the above problems, the rubber crawler according to claim 1,
An endless rubber body,
A plurality of cored bars that are embedded laterally side by side in the rubber body at regular intervals in the circumferential direction Y and that include a pair of drive protrusions that project toward the inner peripheral surface of the rubber body;
A plurality of rubber lugs that are arranged side by side on the outer surface side of the rubber body in the circumferential direction Y at regular intervals so as to project.
A rubber crawler equipped with,
Bolt insertion holes are formed at both ends in the width direction of a part of the plurality of cored bars, and a rubber lug of the cored bar portion having the bolt insertion holes is not provided. Instead, a metal lug is used. The structure is detachably attached and fixed to the core metal with a bolt.

Further, in the rubber crawler according to a second aspect, in the rubber crawler according to the first aspect, a part of the cored bar having the bolt insertion holes formed at the both ends is arranged in plural for every fixed number of the other cored bars. It is characterized by being

The rubber crawler according to claim 3 is the rubber crawler according to claim 1 or 2, wherein the metal lug structure corresponds to the bolt insertion holes of the part of the cored bar at both ends in the width direction. It is characterized by comprising a main body having bolt insertion holes at both ends in the width direction and a lug protruding from the main body.

A rubber crawler according to a fourth aspect is the rubber crawler according to the third aspect, wherein the lug portion is projected from the rubber lug.

Further, a rubber crawler according to a fifth aspect is the rubber crawler according to the third or fourth aspect, characterized in that at least one notch portion is formed at a tip end portion of the lug portion.

In the rubber crawler of the present invention, as described above, bolt insertion holes are formed at both ends in the width direction of a part of the plurality of cored bars, and the rubber lug of the cored bar portion having the bolt insertion holes is Instead of providing it, instead of this , the metal lug structure is detachably attached and fixed to the core metal with bolts, so that the metal lug bites into the frozen road surface and You will be able to increase the grip.
Therefore, a forestry work vehicle or the like can be driven without slipping even on a frozen road surface.

Further, since the metal lug structure is attached and fixed to some cores with bolts, the metal lug structure can be easily replaced when the lug portion is worn.
Furthermore, by removing the metal lug structure from a part of the cored bar, traveling on a paved road becomes possible.

Further, the grip force can be increased by making the metal lug portion slightly protrude from the rubber lug.

Further, since the notch is formed at least at one location at the tip of the metal lug, the skid prevention effect can be enhanced.

1 is a plan view showing an endless track traveling device to which a rubber crawler of Example 1 is applied. 1 is a rear view showing an endless track running device to which a rubber crawler of Example 1 is applied. 1 is a right side view showing an endless track traveling device to which a rubber crawler of Example 1 is applied. FIG. 3 is an enlarged bottom view of a main part of the rubber crawler of the first embodiment. FIG. 3 is an enlarged side view of a main part of the rubber crawler of the first embodiment. FIG. 6 is an enlarged vertical sectional view taken along the line S6-S6 of FIG. 5. It is an expanded longitudinal cross-sectional view showing a cored bar. It is an enlarged front view showing a metal lug structure. It is an expansion bottom view which shows a metal lug structure.

Embodiments of the present invention will be described below with reference to the drawings.

First, the rubber crawler of the first embodiment will be described with reference to the drawings. In the following description, “width direction X” means the width direction of the endless rubber body 1, and “circumferential direction Y” means the circumferential direction (longitudinal direction) of the endless rubber body 1. means.

As shown in FIGS. 4 to 9, the rubber crawler A has an endless rubber main body 1, a plurality of cored bars 2, a steel cord layer 3, and a metal lug structure 4 as main components. I have it.

More specifically, as shown in FIGS. 3 to 5, the endless rubber body 1 has rubber lugs 11 whose left and right tips extend in the width direction X on the outer surface thereof at regular intervals in the circumferential direction Y. It is arranged. However, the shape and arrangement of the rubber lugs 11 are not limited to the shape and arrangement of this embodiment, and can be changed as appropriate. Further, the rubber lug 11 can be formed integrally with the rubber of the rubber body 1 or can be formed separately.

As shown in FIGS. 6 and 7, the plurality of cored bars 2 have their left and right tips extending in the width direction X, and are embedded side by side in the circumferential direction Y of the endless rubber body 1 at regular intervals in a lateral arrangement. Has been done.
Further, the core metal 2 is provided with a pair of drive protrusions 21 protruding toward the inner peripheral surface of the endless rubber body 1.
The outer peripheral surface of the drive protrusion 21 is also covered with the rubber elastic body of the rubber body 1.

A bolt insertion hole 22 is formed at both ends of the core metal 2a of the plurality of core metals 2 in the width direction X.

The steel cord layer 3 is endlessly embedded in the rubber body 1 outside the core metal 2.

As shown in FIGS. 6, 8 and 9, the metal lug structure 4 does not have the rubber lug 11 of the core bar 2a, but instead is detachably attached to the core bar 2a with bolts and nuts 41. It is fixed.
Note that, as shown in FIG. 3, a plurality of metal lug components 4 and the core metal 2a are arranged so that at least one abuts on the road surface.

The metal lug structure 4 includes a main body portion 4a having bolt insertion holes 42 at both ends in the width direction X corresponding to the bolt insertion holes 22 of the core metal 2a at both ends in the width direction X, and the main body portion. It is comprised with the lug part 4b which protrudes from 4a.

Further, the lug portion 4b of the metal lug structure 4 projects slightly toward the outer peripheral surface side from the rubber lug 11, as shown in FIGS.

Further, as shown in FIGS. 8 and 9, notches 4c are formed at two positions in the width direction X at the tip of the lug 4b.

Next, the operation and effect of the first embodiment will be described.
In the rubber crawler A of the first embodiment, as described above, the bolt insertion holes 22 are formed at both widthwise end portions of some of the cored bars 2a of the plurality of cored bars 2. A rubber lug 11 is not provided for a part of the cored bar 2a, and instead, a metal lug structure 4 is detachably attached and fixed to a part of the cored bar 2a with bolts and nuts 41. As a result, the metal lug portion 4b can bite into the frozen road surface and enhance the grip force on the frozen road surface.
Therefore, a forestry work vehicle or the like can be driven without slipping even on a frozen road surface.

Further, since the metal lug structure 4 is attached and fixed to a part of the core metal 2a by the bolts and nuts 41, the metal lug structure 4 can be easily attached when the lug portion 4b is worn. Can be exchanged.
Furthermore, by removing the metal lug structure 4 from a part of the cored bar 2a, traveling on a paved road becomes possible.

Further, the grip force can be increased by making the metal lug portion 4 slightly protrude from the rubber lug 11.

Further, since the cutout portions 4c are formed at two positions in the width direction X at the tip end portion of the metal lug portion 4b, the skid prevention effect can be enhanced.

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and a design change and the like within a range not departing from the gist of the present invention are also included in the present invention.

For example, in the embodiment, the example in which the notch 4c is formed at two positions in the width direction X at the tip of the metal lug 4b is shown, but the number thereof is arbitrary.

A rubber crawler 1 endless rubber body 11 rubber lug 2 core metal 2a partial core metal 21 drive protrusion 22 bolt insertion hole 3 steel cord layer 4 metal lug structure 4a main body portion 4b lug portion 4c notch portion 41 bolt/ Nut 42 Bolt insertion hole

Claims (5)

An endless rubber body,
A plurality of cored bars that are embedded laterally side by side in the rubber body at regular intervals in the circumferential direction Y and that include a pair of drive protrusions that project toward the inner peripheral surface of the rubber body;
A plurality of rubber lugs that are arranged side by side on the outer surface side of the rubber body in the circumferential direction Y at regular intervals so as to project.
A rubber crawler equipped with,
Bolt insertion holes are formed at both ends in the width direction of a part of the cored bar among the plurality of cored bars, and a rubber lug for the cored bar portion having the bolt insertion holes is not provided. Instead, a metal lug is used. A rubber crawler, wherein the structure is detachably attached and fixed to the core metal with a bolt. The rubber crawler according to claim 1, wherein a part of the cored bar having the bolt insertion holes formed at the both ends thereof is arranged in a predetermined number of other cored bars. The rubber crawler according to claim 1 or 2, wherein the metal lug structure has bolt insertion holes at both end portions in the width direction corresponding to bolt insertion holes of the part of the cored bar at both end portions in the width direction. A rubber crawler comprising a main body part and a lug part protruding from the main body part. The rubber crawler according to claim 3, wherein the lug portion is projected from the rubber lug. The rubber crawler according to claim 3 or 4, wherein at least one notch is formed at a tip portion of the lug portion.

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