JP2007216837A - Rubber crawler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure that all three rubber projections formed on an inner peripheral surface of a rubber crawler are used for transmission of drive force in the rubber crawler improving engagement with a sprocket, bringing close to one another the pressure applied to the respective rubber projections as much as possible, lowering the pressure and not generating break of a tooth and damage to the rubber projection. <P>SOLUTION: In the core metal-less rubber crawler, a steel cord 3 is buried in a longitudinal direction of the rubber crawler and a rubber lug 2 is formed on its outer peripheral surface. A central rubber projection 12 and side part rubber projections 13, 14 are formed on the inner peripheral surface at a center and left and right sides with a constant intervals. These three rubber projection are formed in a longitudinal direction in series and are formed in a width direction in a linear line shape. All rubber projections are engaged with a sprocket 21. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a driving system for a coreless rubber crawler.

  In the coreless rubber crawler, a central rubber protrusion is formed on the inner peripheral surface with a constant pitch, and a driving system in which the central rubber protrusion meshes with a sprocket installed on the machine body side to transmit a driving force has been widely adopted. Speaking from the center rubber projection side, it had both a function of transmitting driving force and a so-called detachment preventing function that prevents the wheels from coming off.

  There is a proposal for separating the functions of the central rubber protrusion and separately providing rubber protrusions suitable for each function (Patent Document 1). According to this proposal, a central rubber protrusion for preventing disengagement is formed at the center of the inner peripheral surface in the longitudinal direction of the rubber track, and a pair of driving side rubber protrusions are formed in the left and right width directions. The rubber protrusions are formed by differentiating the height and width of each rubber protrusion according to the required function by separating the functions of the rubber protrusions.

JP-A-6-32262

  However, when the rubber crawler is turning, a brake is applied to the rubber crawler on one side mounted on the airframe, and a driving force for moving forward or backward is applied to the other side. For this reason, in the rubber crawler on the side to which the driving force is applied, the side rubber projections for driving are formed so as to extend in the width direction of the rubber crawler, so that the meshing with the sprocket is the same. Since the engagement force (pressure received by the rubber protrusion) is always different, tooth skipping occurs or the rubber protrusion is lost.

  The present invention has been made in view of the prior art as described above, improves the meshing with the sprocket, brings the pressure applied to each rubber projection as close as possible, and lowers the pressure so that tooth skipping and rubber projection This is designed to prevent defects.

  The gist of the present invention (Claim 1) is a core metal-less rubber crawler in which a steel cord is embedded in the longitudinal direction of a rubber crawler and a rubber lug is formed on the outer peripheral surface thereof. Central rubber projections and side rubber projections are formed at regular intervals on the left and right, these three rubber projections are formed in series in the longitudinal direction, and are formed in a straight line in the width direction. This is a coreless rubber crawler characterized by the fact that the rubber protrusions are engaged with each other.

  In the second and subsequent aspects, the rubber crawler according to the first aspect is specified to provide a preferable effect. In the second aspect, the central rubber protrusion and the side rubber protrusion are provided. The above-mentioned rubber crawler in which a wheel rolls between the two is provided.

  According to a third aspect of the present invention, there is provided the rubber crawler in which the center width of the central rubber projection and the side rubber projection are substantially the same in the longitudinal base width.

  According to a fourth aspect of the present invention, there is provided the rubber crawler in which the central rubber protrusion and the side rubber protrusion have substantially the same height.

  According to a fifth aspect of the present invention, there is provided the rubber crawler in which the central rubber projection and the side rubber projection have substantially the same shape in a side view.

  The present invention is as described above, and has a structure in which all three rubber protrusions formed on the inner peripheral surface of the rubber crawler are used for transmission of driving force. Is smoothly performed, the pressure received by the rubber protrusion is reduced, and the occurrence of tooth skipping and rubber chipping can be reduced.

  In the second and subsequent aspects, the shape of the rubber protrusion and the relationship between them are specified in order to further enhance the effect, and each of them further brings about the feature that the meshing with the sprocket becomes smooth. .

  In Patent Document 1, as described above, the functions of the rubber protrusions are separated and configured. However, the present invention re-evaluates the functions of the proposed rubber protrusions and proposes them as the most preferable mode. . That is, each rubber protrusion formed on the inner peripheral surface of the rubber tracker is specified to have a configuration suitable for transmission of the driving force. As a result, the pressure received by each rubber protrusion is reduced, and the sprocket teeth skip. Further, the occurrence of chipping of each rubber protrusion is reduced.

  If a preferable form is described for each rubber protrusion, the base width in the longitudinal direction of any rubber protrusion should be substantially the same (Claim 3), and the center rubber protrusion and the side rubber protrusion have substantially the same height ( Further, the shape of the central rubber projection and the side rubber projection in the side view is substantially the same (Claim 5), so that the sprocket side, which is the mating counterpart, also meets all the conditions. It is possible to make them identical.

  Incidentally, the wheel rolls between the center rubber protrusion and the side rubber protrusion, and this serves to prevent the wheel from coming off. Needless to say, the protrusion can provide a function of preventing detachment.

  The present invention will be further described below with reference to examples. FIG. 1 is a plan view of an inner peripheral side showing a first embodiment of the rubber track of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a cross-sectional view taken along line AA. In the figure, reference numeral 1 is a rubber elastic body constituting a rubber crawler, 2 is a lug on the outer peripheral surface side, and 3 is a steel cord embedded in the longitudinal direction.

  A central rubber protrusion 12 is formed at the center of the inner peripheral surface of the rubber track, and side rubber protrusions 13 and 14 are formed with a certain width on the left and right. These rubber protrusions 12, 13, and 14 have substantially the same width in the base portion in the longitudinal direction, and the length in the width direction of the central rubber protrusion 12 is almost twice the length of the other rubber protrusions 13 and 14. It has become. When viewed from the side, these rubber protrusions 12, 13, and 14 all have substantially the same shape.

  For this reason, all the meshing parts in the sprocket may have substantially the same configuration. In the figure, reference numeral 21 denotes a sprocket, which is composed of a pair of disks 23 each having a flange 22 at the periphery, and a pin 24 is erected through the disk, and the pin 24 is connected to each rubber protrusion 12, 13, 14 will be engaged. For this reason, it is preferable that the shape of each rubber protrusion 12, 13, and 14 in the side view is substantially the same. Of course, although not shown, the sprocket may be of a gear type.

  The length of the central rubber protrusion 12 in the width direction is larger than the lengths of the other rubber protrusions 13 and 14, but this may be distorted by the flange 22 of the sprocket 21 or may be caused by a wheel (not shown). It is a countermeasure for adding distortion.

  FIG. 4 shows a second embodiment of the rubber track of the present invention. In this example, the height of the central rubber projection 12 is first made slightly higher than the other rubber projections 13 and 14. This is a measure for further increasing the detachment prevention function.

  Reference numeral 31 denotes a wheel. In the figure, the wheel is not shown, but the normal wheel 31 has a structure straddling the central rubber protrusion 12, and between the central rubber protrusion 12 and the left and right side rubber protrusions 13, 14. When the peripheral edges 32 and 33 are in contact with the inner peripheral surfaces 15 and 16 of the rubber crawler, the wheels 31 in this example are side disks 34 and 35 sandwiching the rubber protrusions 12 and 13 on the side portions. The disks 34 and 35 are in contact with the inner peripheral surfaces 17 and 18 of the rubber crawler and are configured to travel while sandwiching the side rubber protrusions 13 and 14. Therefore, the rolling wheels themselves are improved so that all the rubber protrusions have a function of preventing detachment.

  The present invention is as described above. Three rubber protrusions are formed on the inner peripheral surface of the coreless rubber crawler, the shape and position thereof are specified, and any of the rubber protrusions is used to transmit the driving force. It has a large feature such that the pressure received by the rubber protrusion is reduced, the distortion to the rubber protrusion is reduced, and the chipping of the rubber protrusion is reduced, and it can be widely applied to the coreless rubber crawler. It is.

FIG. 1 is a plan view of an inner peripheral side showing a first embodiment of the rubber track of the present invention. FIG. 2 is a side view of FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is a view similar to FIG. 3 showing a second embodiment of the rubber track of the present invention.

Explanation of symbols

1. Rubber elastic body,
2 lag,
3. Steel code,
12. Center rubber protrusion,
13, 14 ... Side rubber protrusions,
21 ... Sprocket,
22 ... Flange,
23. Disc,
24 ... pin,
31 ... Wheel.

Claims (5)

  In a metal core-less rubber crawler in which a steel cord is embedded in the longitudinal direction of the rubber crawler and a rubber lug is formed on the outer peripheral surface thereof, the central rubber protrusion and the side are spaced apart from the center on the inner peripheral surface and at regular intervals on the left and right. The core is characterized in that a rubber protrusion is formed, these three rubber protrusions are formed in series in the longitudinal direction and are formed in a straight line in the width direction, and all the rubber protrusions mesh with the sprocket. Gold-less rubber crawler.   2. A rubber crawler according to claim 1, wherein the roller rolls between the central rubber protrusion and the side rubber protrusion.   The rubber crawler according to claim 1 or 2, wherein the base width in the longitudinal direction of the central rubber protrusion and the side rubber protrusion is substantially the same.   4. A rubber crawler according to claim 1, wherein the central rubber protrusion and the side rubber protrusion have substantially the same height.   The rubber crawler according to any one of claims 1 to 4, wherein the central rubber protrusion and the side rubber protrusion have substantially the same shape in a side view.

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