JPH0811549B2 - Endless orbit - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an endless track belt used as a belt for driving, and more specifically, an infinite track used for driving a snowmobile, a snow blower, or the like. It relates to the orbital zone.

[Prior art]

Conventionally, as an endless track band used in snowmobiles, agricultural machines, etc., for example, a plurality of traction projections are provided on the outer peripheral surface of an endless track body in which a tensile strength core is embedded, and Specifically, metal or FR
A lateral rigid material made of P is embedded in the track body. However, in such a conventional endless track zone, there is a problem that the track body becomes unusable due to damage to the lateral rigid material and the like, in addition to being large in weight and expensive.

Therefore, in order to compensate for such a problem, for example, by embedding a thread or a woven fabric at a predetermined interval to increase the lateral rigidity (US Pat. No. 3,858,948) and by mixing short fibers in the rubber material, the rigidity is improved. What is configured to increase (Actual Kosho 59-24
No. 607) is proposed.

However, in the case of the conventionally proposed products as described above, in order to exert the lateral rigidity for practical use, the track body has to be constructed very thick, and therefore, in the case of such a configuration. However, there is a problem in that it is difficult to bend, the weight of the whole is large, the handling is inconvenient, and the driving device must be large.

[Object of the Invention]

The present invention has been devised by focusing on such a conventional problem, and an object thereof is to provide an endless track zone capable of enhancing lateral rigidity without thickening the track body. .

[Structure of Invention]

In order to achieve the above object, the present invention integrally includes a plurality of traction protrusions on an outer peripheral surface of an endless raceway main body having a tensile strength core embedded therein at predetermined intervals in a direction intersecting the longitudinal direction of the raceway main body. In the rubber crawler belt provided in, each of the index protrusions is filled with a plurality of reinforcing cords along the longitudinal direction of the pulling protrusion from the hem portion over the entire pulling protrusion in substantially the same length as the pulling protrusion. The volume filling rate of the reinforcing cord with respect to each pulling projection is set to 20% or more and less than 70%.

Example of Invention

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partially enlarged perspective view of a rubber-made endless track belt according to the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG.
FIG. 3 is a sectional view taken along the line III-III in FIG. 1, and 1 is an endless track body in which a tensile strength core body 5 is embedded in the longitudinal direction. , The track body 1
A plurality of traction projections 2 are integrally provided at a predetermined interval in a direction intersecting the longitudinal direction of the drive projection 3, and a drive projection 3 that engages with a drive mechanism (not shown) is provided on the back surface 1b.

As shown in FIGS. 2 and 3, inside each of the pulling protrusions 2, the pulling protrusions 2 have substantially the same length as the pulling protrusions 2.
A plurality of reinforcing cords 4 are provided substantially parallel to each other along the longitudinal direction of
And the reinforcing cords 4 are filled at a predetermined ratio with respect to the volume of the pulling protrusion 2. The reinforcing cord 4 is filled from the hem portion of the pulling projection 2 to the whole, and the above-mentioned tensile strength core body 5 is embedded in the lower portion of the reinforcing cord 4.

The volume filling rate (%) of the reinforcing cord 4 with respect to each of the pulling projections 2 is required to be 20% or more in practical use,
Further, if the filling rate is 70% or more, there is a drawback that the portions where the reinforcing cords 4 are in contact with each other are increased and the durability against peeling of the adhesive is reduced.

Therefore, as a filling rate of this reinforcing cord 4, practically,
It is preferably 30% or more and 60% or less.

The relationship between the filling rate (%) and the longitudinal elastic modulus (E) is
As shown in the figure, this experimental data is the result of filling a polyester yarn having a diameter of 0.8 mm into rubber having a longitudinal elastic modulus of 24 kg / cm ² .

Further, regarding the diameter of the reinforcing cord 4, it is advantageous to use the thin reinforcing cord 4 in consideration of the high strength utilization, but in view of economical efficiency, it is preferably about 0.3 mm to 1.2 mm.

Further, in the above embodiment, when considering the bending rigidity of the shape of the pulling projection 2, the following shape is preferable.

That is, the bending rigidity is generally the longitudinal elastic modulus (E) and the cross-section 2
It is represented by the product (E · I) of the secondary moment (I). In the embodiment of the present invention, the shape of the pulling projection 2 is filled with the reinforcing cord 4 to make it hard, so that it has a triangular cross section or a cross section. It is preferably formed in a trapezoidal shape.

For example, when the second moment of area is calculated in the same area as the area of the traction protrusion 2 having a semicircular cross section, when the second moment of area of the semicircular cross section is 100%, it is about 197% in the triangular cross section The trapezoidal cross-section was about 126%, and it was found that the one having the triangular cross-section and the trapezoidal cross-section was far more effective than the pulling projection 2 having the second moment of inertia of the cross-section.

Next, FIGS. 5 and 6 show a second embodiment of the present invention, which is a cross-sectional view similar to FIGS. 2 and 3 of the first embodiment described above. A core body protection layer 6 is provided below the layer in which the body 5 is embedded in order to increase the lateral rigidity of the track body 1.

The other configurations are the same as those in the first embodiment, and therefore, the same reference numerals are given and the description thereof is omitted.

〔The invention's effect〕

As described above, the endless raceway belt of the present invention has a plurality of traction projections on the outer peripheral surface of the endless raceway body in which the tensile strength core is embedded, with a predetermined interval in the direction intersecting the longitudinal direction of the raceway body. In the rubber-made endless track provided integrally,
Inside each of the pulling projections, a plurality of reinforcing cords are filled along the longitudinal direction of the pulling projections from the hem portion over the entire pulling projections with substantially the same length as the pulling projections, and the volume of the reinforcing cords for each pulling projection. Since the filling rate is 20% or more and less than 70%, the following excellent effects are exhibited.

That is, since a plurality of reinforcing cords are filled along the longitudinal direction of each of the tow protrusions provided in the rubber endless track along the length of the tow protrusion from the hem portion to the entire tow protrusion, The lateral rigidity of the protrusion can be significantly improved, and the lateral rigidity of the endless track zone can be effectively increased practically without increasing the thickness of the track body.

Moreover, by setting the volume filling rate of the reinforcing cord to each pulling protrusion to 20% or more and less than 70%, it is possible to prevent the peeling of the reinforcing cord from the rubber material of the pulling protrusion to which the pulling force is applied. Therefore, it is possible to increase the lateral rigidity of the endless track zone without lowering the durability of the traction protrusion.

In addition, since it is not necessary to make the track body thick, the track body can be easily bent, and the weight and weight can be manufactured at low cost. It can be made smaller than that.

In addition, since multiple reinforcement cords are filled from the hem to the entire traction protrusion, the multiple reinforcement cords are dispersed in the traction protrusion, so that the bar-shaped lateral rigidity embedded like in the past is used. There is no possibility that the endless orbital band will become unusable due to material damage, and the structure will be less likely to be damaged, and the durability of the endless orbital band can be improved.

[Brief description of drawings]

1 is a partially enlarged perspective view of an endless orbital zone embodying the present invention, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a sectional view taken along the line III-III in FIG. FIGS. 4 and 5 are explanatory views showing the relationship between the filling rate and the longitudinal elastic modulus, and FIGS. 5 and 6 are similar to FIGS. 2 and 3 showing the second embodiment of the present invention. . 1 ... Track main body, 1a ... Outer peripheral surface side, 2 ... Traction protrusion,
4 ... Reinforcing cord, 5 ... Tensile strength core.

 ─────────────────────────────────────────────────── ─── Continued Front Page (56) References Japanese Patent Publication No. 47-2897 (JP, B1) Japanese Publication No. 43-30340 (JP, B1) Actual Publication No. 59-24607 (JP, Y2)

Claims (1)

[Claims] 1. A rubber body integrally provided with a plurality of traction protrusions on an outer peripheral surface of an endless raceway body having a tensile strength core embedded therein at predetermined intervals in a direction intersecting the longitudinal direction of the raceway body. In the endless track zone, a plurality of reinforcing cords are filled inside each of the traction projections along the longitudinal direction of the traction projections from the hem portion over the entire traction projections with substantially the same length as the traction projections. A tracked track with a volume filling rate of 20% or more and less than 70%.